g(x, y) = f(x) + f3(y)

#include<stdio.h>
#include<math.h>
int f(int, int, int);                                  /* function prototype for f(x)   */
int main()
{
          int a,b;
          int x,y;
          double g;                                           /*       g=g(x,y)         */
          printf("a, b: ");
          scanf("%d%d",&a, &b);
          printf("x,y: ");
          scanf("%d%d",&x, &y);
          g=(f(x,a,b))+(pow((f(y,a,b)),3));             /* make sure that return value of pow()
                                                                                                      function is assigned to double  */
          printf("g(%d,%d)=%g",x,y,g);
          return 0;
}
int f(int x, int a, int b)
{
         return(a*x+b);
}

Sample input:

a, b: 5 6
x, y: 2 6

Output:

g(2,6)=46672