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Adding two Integer number using Function. /* Adding two Integer number using Function.*/  #include <stdio.h> int sum( int x, int y); /* function prototype */ int sub( int x, int y); int mul( int x, int y); int div( int x, int y);  /* function main begins program execution */  void main( )  {     sum (5,7);     sub (10,5);     mul (10,5);     div (10,5);  } /* end main */ /* Function maximum definition */ /* x, y and z are parameters */ int sum( int x, int y) {     printf ("%d", x+y);     getch(); } /* end function maximum */ int sub( int x, int y) {     printf ("%d", x-y);     getch(); } int mul( int x, int y) {     printf ("%d", x*y);     getch(); } int div( int x, int y) {     printf ("%d", x/y);     getch(); } Output:

Using Function: Finding the maximum of three integers. /* Fig. 5.4: fig05_04.c     Finding the maximum of three integers */  #include <stdio.h> int maximum( int x, int y, int z ); /* function prototype */  /* function main begins program execution */  int main( void )  {     int number1; /* first integer */     int number2; /* second integer */     int number3; /* third integer */     printf( "Enter three integers: " );     scanf( "%d%d%d", &number1, &number2, &number3 );     /* number1, number2 and number3 are arguments        to the maximum function call */     printf( "Maximum is: %d\n",  );     return 0; /* indicates successful termination */  } /* end main */ /* Function maximum definition */ /* x, y and z are parameters */ int maximum( int x, int y, int z ) {    int max = x; /* assume x is largest */    if ( y > max ) { /* if y is larger than