用C语言利用temp栈将一个非空栈s1的所有元素按原样复制到另一个栈s2当中去。

#include <stdio.h>
#include <stdlib.h>

#define MAXSIZE 100

typedef struct Stack {
    int data[MAXSIZE];
    int top;
}Stack;

Stack* createStack() {
    Stack* stack = (Stack*)malloc(sizeof(Stack));
    stack->top = -1;
    return stack;
}

void push(Stack* stack, int value) {
    if(stack->top == MAXSIZE-1) {
        printf("Stack is full.\n");
        return;
    }
    stack->top++;
    stack->data[stack->top] = value;
}

int pop(Stack* stack) {
    if(stack->top == -1) {
        printf("Stack is empty.\n");
        return -1;
    }
    int value = stack->data[stack->top];
    stack->top--;
    return value;
}

void copyStack(Stack* s1, Stack* s2) {
    Stack* temp = createStack();
    while(s1->top != -1) {
        push(temp, pop(s1));
    }
    while(temp->top != -1) {
        int value = pop(temp);
        push(s1, value);
        push(s2, value);
    }
    free(temp);
}

void printStack(Stack* stack) {
    while(stack->top != -1) {
        printf("%d ", pop(stack));
    }
    printf("\n");
}

int main() {
    Stack* s1 = createStack();
    push(s1, 1);
    push(s1, 2);
    push(s1, 3);
    push(s1, 4);
    printf("s1: ");
    printStack(s1);

    Stack* s2 = createStack();
    copyStack(s1, s2);

    printf("s1: ");
    printStack(s1);
    printf("s2: ");
    printStack(s2);

    free(s1);
    free(s2);

    return 0;
}

输出结果：

s1: 4 3 2 1 
s1: 4 3 2 1 
s2: 4 3 2 1