Question

I’m trying to take a character as input, and give its ascii value as output until the user gives 0 as input. It works, but there is always an extra ascii value of 10 being displayed. what am I doing wrong?

#include <stdio.h>
#include <stdlib.h>
int main(void){
    printf("Welcome to ASCII:\n");
    char input;
    while(input != 48){
        scanf("%c", &input);
        printf("ascii: %d\n", input);
    }
    printf("done\n");

}

output

Welcome to ASCII:
e
ascii: 101
ascii: 10
h
ascii: 104
ascii: 10
l
ascii: 108
ascii: 10
0
ascii: 48
done

Answer 1

10 is the ASCII value for '\n', the newline character generated when you press Enter. You could add a check for that character and not print its value.

Also it’s good style to use '0' instead of writing the ASCII value 48.

while (input != '0') {
    scanf("%c", &input);

    if (input != '\n') {
        printf("ascii: %d\n", input);
    }
}