Implement Stack Using Array with Push and Pop Operations

Code

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

#define MAX 10

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

    char operation[10];
    int value;

    for(int i = 0; i < n; i++) {
        scanf("%s", operation);
        
        if(strcmp(operation, "push") == 0) {
            scanf("%d", &value);
            
            // Check for overflow
            if(top >= MAX - 1) {
                printf("Stack Overflow\n");
            } else {
                // Push the value
                top++;
                stack[top] = value;
            }
        }
        else if(strcmp(operation, "pop") == 0) {
            // Check for underflow
            if(top < 0) {
                printf("Stack Underflow\n");
            } else {
                // Pop and print the value
                printf("%d\n", stack[top]);
                top--;
            }
        }
    }

}

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