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Source code for this Tutorial

#include <stdio.h>
#include <stdlib.h>
void display(int);

int main()
{
    int num = 10;

    printf("num = %d\n",num);
    display(num);
    printf("num = %d\n",num);

    return 0;
}

void display(int a){
    a = 20;
    printf("%d\n",a);
}