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) {
    int st[MAX],cnt=0,val;
    char cmd[5];  
    for(int i=0;i<n;i++){
        scanf("%s",cmd);
        if(!strcmp(cmd,"push")){
            scanf("%d",&val);
            if(cnt==MAX){
                printf("Stack Overflow\n");
                continue;
            }
            st[cnt++]=val; 
        }
        else if(!strcmp(cmd,"pop")){
            if(!cnt){
                printf("Stack Underflow\n");
                continue;
            }
            printf("%d\n",st[--cnt]);
        }
    }
    
}

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