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//keychecker
int scanc()
{
    int result=0;
    char in;
 
    while (in==0)
    {
        scanf("%c", &in);
        result=atoi(in);
 
        if (result==0)
            printf("Incorrect input!");
    }
    return (result);
}

prog.c: In function 'scanc':
prog.c:9:9: warning: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
         scanf("%c", &in);
         ^
prog.c:9:9: warning: incompatible implicit declaration of built-in function 'scanf'
prog.c:9:9: note: include '<stdio.h>' or provide a declaration of 'scanf'
prog.c:10:16: warning: implicit declaration of function 'atoi' [-Wimplicit-function-declaration]
         result=atoi(in);
                ^
prog.c:13:13: warning: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
             printf("Incorrect input!");
             ^
prog.c:13:13: warning: incompatible implicit declaration of built-in function 'printf'
prog.c:13:13: note: include '<stdio.h>' or provide a declaration of 'printf'
/usr/lib/gcc/i586-linux-gnu/5/../../../i386-linux-gnu/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: error: ld returned 1 exit status

Standard output is empty