arg_example1.c

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/**
 * arg_example1.c
 *
 * Illustrates argument passing in C
 *
 * Compile:  Using Linux and gcc
 *           gcc -g -Wall -o arg_example1 arg_example1.c
 * Run:      ./arg_example1
 */

#include <stdio.h>

/* Note: we moved this function up above main() to demonstrate an alternative to
 * function prototypes. In general, though, you should provide the prototypes.*/
void pass_by_value(int x, int y, int z) {
   printf("In pass_by_value, x = %d, y = %d, z = %d\n", x, y, z);
   /* Let's manipulate these variables here: */
   x = 2 + x;
   y = y - 3;
   z = 7 + z;
   /* Print out the changes: */
   printf("In pass_by_value, x = %d, y = %d, z = %d\n", x, y, z);
}

int main(void) {
   int x, y, z;

   printf("Enter three ints (ex: 8 4 1)\n");
   scanf("%d%d%d", &x, &y, &z);

   printf("In main, x = %d, y = %d, z = %d\n", x, y, z);
   pass_by_value(x, y, z);

   /* Last print statement. Will the output change? */
   printf("In main, x = %d, y = %d, z = %d\n", x, y, z);

   return 0;
}