Please fix the code given below to perform subtraction of two inputs:
#include <stdio.h>
#include <stdlib.h>
int readNumber();
void $1(int number);
int main(int argc, char *argv[])
{
int a, b;
a = $2;
b = $3;
writeNumber($4);
return 0;
}
void writeNumber(int number){
printf("%d",number);
return;
}
int readNumber(){
int x;
scanf("%d", &x);
return x;
}
Input 1
10 11
Output 1
10 11
-1
Input 2
90 12
Output 2
90 12
78