// function to add, sub without using the operators #include // Prototypes int add(int, int); int sub(int, int); int main() { int a, b; printf("Enter two integers\n"); scanf("%d %d", &a, &b); int s,d; d = add(a,b); s = sub(a,b); printf("%d %d",s,d); // output 2 and 10 return 0; } // function to add int add(int a, int b) { int c = 0; //carry while(b !=0) { c = a&b; a = a^b; b = c<<1; } return a; } // function to sub int sub(int a, int b) { int s,d; d = add((~b),1); s = add(a,d); return s; } // subtraction is addition in disguise (just flip the subtracting term and that's what this function does.)