Question

The code below does not print anything –

int main() {

        char *input = "This is a string";
        find_length(input);
        return 0;

}
void find_length(char *input){

    printf("%s", input);
    int length = 0;
    while(input[length]!='\0');
    {
        length++;
        printf("%i", length);
    }

}

Answer 1

You have an extra semicolon behind your loop:

while(input[length]!='\0');
                          ^ does not belong here!!!

So it is stuck in an infinite loop. Get rid of it.

---

Furthermore, there could be stream buffering. Try adding some \n. Or call fflush(stdout) to flush the output stream.

void find_length(char *input){

    printf("%s\n", input);
    int length = 0;
    while(input[length]!='\0')  //  remove ;
    {
        length++;
        printf("%i\n", length);
    }

}