#include <stdio.h>

extern "C"{
  unsigned int expression_1(unsigned int val_a, unsigned int val_b);}
extern "C"{
  unsigned int expression_2(unsigned int val_a, unsigned int val_b);
}
extern "C"{
  int expression_3(int sVal_a, int sVal_b);}
extern "C"{
  int expression_4(int sVal_a, int sVal_b);}

int main() {

    unsigned int val_a = 100;
    unsigned int val_b = 25;
    int sVal_a = -8;
    int sVal_b = -2;

    
    printf("Result of Expression 1: %u\n", expression_1(val_a, val_b));
    printf("Result of Expression 2: %u\n", expression_2(val_a, val_b));
    printf("Result of Expression 3: %d\n", expression_3(sVal_a, sVal_b));
    printf("Result of Expression 4: %d\n", expression_4(sVal_a, sVal_b));

    return 0;
}