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Implement Stack Using Array with Push and Pop Operations

 

#include <stdio.h>
#include <stdint.h>
#include <string.h>

#define MAX 10

void process_stack(int n) {
    // Your logic here
    int stack[MAX], top = -1;

    char cmd[32];
    int val;

    for (int i = 0; i < n; i++) 
    {
        scanf("%s", cmd);

        if (strcmp(cmd, "push") == 0) 
        {
            scanf("%d", &val);
            if (top >= MAX - 1) 
            {
                printf("Stack Overflow\n");
            } 
            else 
            {
                stack[++top] = val;
            }
        } 
        else if (strcmp(cmd, "pop") == 0) 
        {
            if (top == -1) 
            {
                printf("Stack Underflow\n");
            } 
            else 
            {
                printf("%d\n", stack[top--]);
            }
        }
    }
}

int main() {
    int n;
    scanf("%d", &n);
    getchar(); // Consume newline after number

    process_stack(n);
    return 0;
}

 

 

 

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Input

5 push 10 push 20 pop pop pop

Expected Output

20 10 Stack Underflow