C0n1B0 - Online C Compiler & Debugging Tool

#include <stdio.h>
int a;
void kakunin1(int a){
    a = a;
}
void kakunin2(int b){
    int a;
    a = b;
}
void kakunin3(int b){
    a = b;
}
int main(void) {
    printf("a = %d\n", a);
    a = 10;
    printf("a = %d\n", a);
    kakunin1(20);
    printf("a = %d\n", a);
    kakunin2(30);
    printf("a = %d\n", a);
    kakunin3(40);
    printf("a = %d\n", a);

	return 0;
}