how to use printf on the command line?
I wanted to try using a simple printf on terminal to see if i can directly program on it , but didn't work; I wrote on it these 2 lines:
~$ #include<stdio.h>
~$ printf("E");
and it says
bash: syntax error near unexpected token '"E"'
I don't see anything wrong...?
command-line
asked Mar 9 at 10:53
wattbattwattbatt
132
add a comment |
I wanted to try using a simple printf on terminal to see if i can directly program on it , but didn't work; I wrote on it these 2 lines:
~$ #include<stdio.h>
~$ printf("E");
and it says
bash: syntax error near unexpected token '"E"'
I don't see anything wrong...?
command-line
asked Mar 9 at 10:53
wattbattwattbatt
132
add a comment |
I wanted to try using a simple printf on terminal to see if i can directly program on it , but didn't work; I wrote on it these 2 lines:
~$ #include<stdio.h>
~$ printf("E");
and it says
bash: syntax error near unexpected token '"E"'
I don't see anything wrong...?
command-line
asked Mar 9 at 10:53
wattbattwattbatt
132
I wanted to try using a simple printf on terminal to see if i can directly program on it , but didn't work; I wrote on it these 2 lines:
~$ #include<stdio.h>
~$ printf("E");
and it says
bash: syntax error near unexpected token '"E"'
I don't see anything wrong...?
command-line
command-line
asked Mar 9 at 10:53
wattbattwattbatt
132
asked Mar 9 at 10:53
wattbattwattbatt
132
asked Mar 9 at 10:53
wattbattwattbatt
132
asked Mar 9 at 10:53
wattbattwattbatt
132
asked Mar 9 at 10:53
wattbattwattbatt
132
132
add a comment |
add a comment |
1 Answer
1
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oldest
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Your shell isn't a C interpreter - it has its own syntax, and its own printf function, which aside from inheriting many of the format specifiers from the C function is quite separate
Valid forms are
printf 'En'
or
printf '%cn' E
There is no equivalent of the #include directive (which would just be an - ignored - comment as far as the shell is concerned)
If you want to actually write a small C program from the command line, you can do that with cat using a here document:
$ cat > main.c
#include <stdio.h>
int main(void) {
printf("Hello world!n");
return 0;
}
Terminate your input py pressing Ctrl+D. Then you can compile the program using gcc:
gcc -o my_first_prog main.c
and finally run it from the shell
$ ./my_first_prog
Hello world!
answered Mar 9 at 11:04
steeldriversteeldriver
68.9k11113184
this is quite silly then, my professor was teaching about the "main" function arguments and wrote on the blackboard a C program with main taking 2 ints from the terminal...saying it could all be written on the shell but i guess it's a lie then
– wattbatt
Mar 9 at 11:11
1
@wattbatt perhaps a misunderstanding: you can certainly write a C program from the command line - however you can't expect the Bash shell to interpret and run it.
– steeldriver
Mar 9 at 11:16
@wattbatt I have added what I imagine your professor had in mind
– steeldriver
Mar 9 at 11:26
1
@wattbatt "but i guess it's a lie then" – apparently you're a newbie with shell and C programming, that's fine, everyone starts as a newbie. But please stop for a moment and think about the probability of your professor knowing something fundamental incorrectly or even telling straight lies, versus you misunderstanding something.
– egmont
Mar 9 at 11:38
add a comment |
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1 Answer
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1 Answer
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votes
Your shell isn't a C interpreter - it has its own syntax, and its own printf function, which aside from inheriting many of the format specifiers from the C function is quite separate
Valid forms are
printf 'En'
or
printf '%cn' E
There is no equivalent of the #include directive (which would just be an - ignored - comment as far as the shell is concerned)
If you want to actually write a small C program from the command line, you can do that with cat using a here document:
$ cat > main.c
#include <stdio.h>
int main(void) {
printf("Hello world!n");
return 0;
}
Terminate your input py pressing Ctrl+D. Then you can compile the program using gcc:
gcc -o my_first_prog main.c
and finally run it from the shell
$ ./my_first_prog
Hello world!
answered Mar 9 at 11:04
steeldriversteeldriver
68.9k11113184
this is quite silly then, my professor was teaching about the "main" function arguments and wrote on the blackboard a C program with main taking 2 ints from the terminal...saying it could all be written on the shell but i guess it's a lie then
– wattbatt
Mar 9 at 11:11
1
@wattbatt perhaps a misunderstanding: you can certainly write a C program from the command line - however you can't expect the Bash shell to interpret and run it.
– steeldriver
Mar 9 at 11:16
@wattbatt I have added what I imagine your professor had in mind
– steeldriver
Mar 9 at 11:26
1
@wattbatt "but i guess it's a lie then" – apparently you're a newbie with shell and C programming, that's fine, everyone starts as a newbie. But please stop for a moment and think about the probability of your professor knowing something fundamental incorrectly or even telling straight lies, versus you misunderstanding something.
– egmont
Mar 9 at 11:38
add a comment |
Your shell isn't a C interpreter - it has its own syntax, and its own printf function, which aside from inheriting many of the format specifiers from the C function is quite separate
Valid forms are
printf 'En'
or
printf '%cn' E
There is no equivalent of the #include directive (which would just be an - ignored - comment as far as the shell is concerned)
If you want to actually write a small C program from the command line, you can do that with cat using a here document:
$ cat > main.c
#include <stdio.h>
int main(void) {
printf("Hello world!n");
return 0;
}
Terminate your input py pressing Ctrl+D. Then you can compile the program using gcc:
gcc -o my_first_prog main.c
and finally run it from the shell
$ ./my_first_prog
Hello world!
answered Mar 9 at 11:04
steeldriversteeldriver
68.9k11113184
this is quite silly then, my professor was teaching about the "main" function arguments and wrote on the blackboard a C program with main taking 2 ints from the terminal...saying it could all be written on the shell but i guess it's a lie then
– wattbatt
Mar 9 at 11:11
1
@wattbatt perhaps a misunderstanding: you can certainly write a C program from the command line - however you can't expect the Bash shell to interpret and run it.
– steeldriver
Mar 9 at 11:16
@wattbatt I have added what I imagine your professor had in mind
– steeldriver
Mar 9 at 11:26
1
@wattbatt "but i guess it's a lie then" – apparently you're a newbie with shell and C programming, that's fine, everyone starts as a newbie. But please stop for a moment and think about the probability of your professor knowing something fundamental incorrectly or even telling straight lies, versus you misunderstanding something.
– egmont
Mar 9 at 11:38
add a comment |
Your shell isn't a C interpreter - it has its own syntax, and its own printf function, which aside from inheriting many of the format specifiers from the C function is quite separate
Valid forms are
printf 'En'
or
printf '%cn' E
There is no equivalent of the #include directive (which would just be an - ignored - comment as far as the shell is concerned)
If you want to actually write a small C program from the command line, you can do that with cat using a here document:
$ cat > main.c
#include <stdio.h>
int main(void) {
printf("Hello world!n");
return 0;
}
Terminate your input py pressing Ctrl+D. Then you can compile the program using gcc:
gcc -o my_first_prog main.c
and finally run it from the shell
$ ./my_first_prog
Hello world!
answered Mar 9 at 11:04
steeldriversteeldriver
68.9k11113184
Your shell isn't a C interpreter - it has its own syntax, and its own printf function, which aside from inheriting many of the format specifiers from the C function is quite separate
Valid forms are
printf 'En'
or
printf '%cn' E
There is no equivalent of the #include directive (which would just be an - ignored - comment as far as the shell is concerned)
If you want to actually write a small C program from the command line, you can do that with cat using a here document:
$ cat > main.c
#include <stdio.h>
int main(void) {
printf("Hello world!n");
return 0;
}
Terminate your input py pressing Ctrl+D. Then you can compile the program using gcc:
gcc -o my_first_prog main.c
and finally run it from the shell
$ ./my_first_prog
Hello world!
answered Mar 9 at 11:04
steeldriversteeldriver
68.9k11113184
edited Mar 9 at 11:25
answered Mar 9 at 11:04
steeldriversteeldriver
68.9k11113184
answered Mar 9 at 11:04
steeldriversteeldriver
68.9k11113184
answered Mar 9 at 11:04
steeldriversteeldriver
68.9k11113184
68.9k11113184
this is quite silly then, my professor was teaching about the "main" function arguments and wrote on the blackboard a C program with main taking 2 ints from the terminal...saying it could all be written on the shell but i guess it's a lie then
– wattbatt
Mar 9 at 11:11
1
@wattbatt perhaps a misunderstanding: you can certainly write a C program from the command line - however you can't expect the Bash shell to interpret and run it.
– steeldriver
Mar 9 at 11:16
@wattbatt I have added what I imagine your professor had in mind
– steeldriver
Mar 9 at 11:26
1
@wattbatt "but i guess it's a lie then" – apparently you're a newbie with shell and C programming, that's fine, everyone starts as a newbie. But please stop for a moment and think about the probability of your professor knowing something fundamental incorrectly or even telling straight lies, versus you misunderstanding something.
– egmont
Mar 9 at 11:38
add a comment |
this is quite silly then, my professor was teaching about the "main" function arguments and wrote on the blackboard a C program with main taking 2 ints from the terminal...saying it could all be written on the shell but i guess it's a lie then
– wattbatt
Mar 9 at 11:11
1
@wattbatt perhaps a misunderstanding: you can certainly write a C program from the command line - however you can't expect the Bash shell to interpret and run it.
– steeldriver
Mar 9 at 11:16
@wattbatt I have added what I imagine your professor had in mind
– steeldriver
Mar 9 at 11:26
1
@wattbatt "but i guess it's a lie then" – apparently you're a newbie with shell and C programming, that's fine, everyone starts as a newbie. But please stop for a moment and think about the probability of your professor knowing something fundamental incorrectly or even telling straight lies, versus you misunderstanding something.
– egmont
Mar 9 at 11:38
this is quite silly then, my professor was teaching about the "main" function arguments and wrote on the blackboard a C program with main taking 2 ints from the terminal...saying it could all be written on the shell but i guess it's a lie then
– wattbatt
Mar 9 at 11:11
this is quite silly then, my professor was teaching about the "main" function arguments and wrote on the blackboard a C program with main taking 2 ints from the terminal...saying it could all be written on the shell but i guess it's a lie then
– wattbatt
Mar 9 at 11:11
1
1
@wattbatt perhaps a misunderstanding: you can certainly write a C program from the command line - however you can't expect the Bash shell to interpret and run it.
– steeldriver
Mar 9 at 11:16
@wattbatt perhaps a misunderstanding: you can certainly write a C program from the command line - however you can't expect the Bash shell to interpret and run it.
– steeldriver
Mar 9 at 11:16
@wattbatt I have added what I imagine your professor had in mind
– steeldriver
Mar 9 at 11:26
@wattbatt I have added what I imagine your professor had in mind
– steeldriver
Mar 9 at 11:26
1
1
@wattbatt "but i guess it's a lie then" – apparently you're a newbie with shell and C programming, that's fine, everyone starts as a newbie. But please stop for a moment and think about the probability of your professor knowing something fundamental incorrectly or even telling straight lies, versus you misunderstanding something.
– egmont
Mar 9 at 11:38
@wattbatt "but i guess it's a lie then" – apparently you're a newbie with shell and C programming, that's fine, everyone starts as a newbie. But please stop for a moment and think about the probability of your professor knowing something fundamental incorrectly or even telling straight lies, versus you misunderstanding something.
– egmont
Mar 9 at 11:38
add a comment |
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