Implement Stack Using Array with Push and Pop Operations

Code

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

#define MAX 10

void push(int stack[], int *top, int val){
    if(*top == MAX){
        printf("Stack Overflow\n");
    }
    else{
        stack[*top] = val;
        (*top)++;
    }
}

void pop(int stack[], int *top){
    if(*top == 0){
        printf("Stack Underflow\n");
    }
    else{
        (*top)--;
        printf("%d\n", stack[*top]);
    }
}

void process_stack(int n) {
    // Your logic here
    int top = 0;
    char input[10];
    int stack[MAX];
    for(int i = 0; i<n ;i++){
        scanf("%s",&input);
        int val;
        if(strcmp(input,"push") == 0){
            scanf("%d",&val);
            push(stack,&top, val);
        }
        else{
            pop(stack,&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