Hello, I'm trying to make a very basic cmd, but I'm having problems ...
My code:
#include <stdio.h>
int main()
{
char arg[300];
scanf("print '%s'", arg);
printf("%s", arg);
fgetc(stdin);
fgetc(stdin);
return 0;
}
So I went to test:
entrada: print 'hello world'
saída: hello //não coloca o que eu queria
But what I wanted was:
entrada: print 'hello world'
saída: hello world
Can anyone explain what's going on?
Because %s reads a word. This means that the whitespace between hello and world is one of the things that makes it stop reading.
Use %[^']s instead. This [^'] means something like " read while not finding a ' character."
It happens that scanf performs the string reading until it finds a space, so its output will be only the corresponding characters before scanf find a space, such as saida: hello .
To read a string that contains blanks, I recommend that you use the command fgets(var, size_var, stdin) in C.
int main(void) {
char arg[300];
printf("print ");
fgets(arg, 300, stdin); //realiza a leitura de uma string com espaços
printf("%s", arg);
fgetc(stdin);
fgetc(stdin);
return 0;
}
Now your output should be hello world .
I hope I have helped.