#include <stdio.h>
 
#define SIZE 7
int stack[SIZE];
int sp;
 
void push(int value);
int pop(void);
 
int main(void)
{
    sp = 0;
 
    int resp, data;
 
    while(1){
        printf("1:push  2:pop  0:end : ");
        scanf("%d", &resp);
 
        if(!resp) break;
 
        switch(resp){
            case 1:
                printf("push : ");
                scanf("%d", &data);
                push(data);
                break;
 
            case 2:
                pop();
                break;
        }
 
        printf("sp=%d\n", sp);
    }
 
    printf("\n");
 
    for(int i = 0; i < sp; i++){
        printf("stack[%d]=%d \n", i, stack[i]);
    }
 
    return 0;
}
 
 
void push(int value)
{
 
	if(sp>=SIZE){
		printf("スタックが満杯で入りませんでした\n");
	}
		else{
			 stack[sp++]=value;
		}
}
		int pop(void)
		{if(sp<=0){
			printf("スタックが空で取り出せませんでした\n");
			return 0;}
			else{return stack[--sp];
		}
 
}

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