All letters of the alphabet, symbols, and number keys on the keyboard have ASCII codes : char read « Data Type « C Tutorial

1. C Tutorial
2. Data Type
3. char read

ASCII code values range from 0 to 127.

#include <stdio.h>
 
int main()
{
    char key;
 
    printf("Press a key on your keyboard:");
    key=getchar();
    printf("You pressed the '%c' key.\n",key);
    printf("Its ASCII value is %d.\n",key);
    return(0);
}

Press a key on your keyboard:1
      You pressed the '1' key.
      Its ASCII value is 49.