#include<stdio.h>

void swap_a(int a,int b){
    int tmp;
    tmp = a;
    a = b;
    b = tmp;
}

void swap_b(int*a,int*b){
    int tmp;
    tmp =*a;
    *a = *b;
    *b = tmp;
}

void swap_c(int*a,int*b){
    int *tmp;
    tmp = a;
    a = b;
    b = tmp;
}

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

int main(){
    int a,b;

    a = 100; b = 200;
    swap_print(a,b);

    printf("値渡しで関数に引数を受け渡した場合,");
    swap_a(a,b);
    swap_print(a,b);

    printf("参照渡しで関数に引数を受け渡した場合ー１,");
    swap_b(&a,&b);
    swap_print(a,b);

    printf("参照渡しで関数に引数を受け渡した場合ー２,");
    swap_c(&a,&b);
    swap_print(a,b);

    return(0);
}