Implement Stack Using Array with Push and Pop Operations

Code

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

#define MAX 10
int cnt=0;

void process_stack(int n) {
    // Your logic here
    int arr[MAX],top=-1,val;
    char cmd[10];
    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{
            
                arr[++top]=val;
            }
        }
        else if (strcmp(cmd, "pop") == 0)
        {
            if(top==-1)
            {
                printf("Stack Underflow\n");
            }
            else
            {
                printf("%d\n",arr[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