Implement Stack Using Array with Push and Pop Operations

Code

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

#define MAX 10

void process_stack(int n) {
    int stack[MAX];
    int top = -1;
    while (n--) {
        char operation[10];
        scanf("%s",operation);
        if (!strcmp(operation,"push")) {
            int value;
            scanf("%d",&value);
            if (top < MAX - 1) {
                stack[++top] = value;
            } else {
                printf("Stack Overflow\n");
            }
        } else if (!strcmp(operation,"pop")) {
            if (top >= 0) {
                printf("%d\n", stack[top--]);
            } else {
                printf("Stack Underflow\n");
            }
        }
    }
}

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

    process_stack(n);
    return 0;
}

Solving Approach

 

 

 

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Input

5 push 10 push 20 pop pop pop

Expected Output

20 10 Stack Underflow