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],index=0;
    for(int i=0;i<n;i++){
        char str[100];
        fgets(str,sizeof(str),stdin);
        if(strncmp(str, "push", 4) == 0){
            if(index==MAX){
                printf("Stack Overflow\n");
                continue;
            }
            else{
            int j=0;
            int int_part=0;
            while(str[j]!='\0'){
                if(str[j]>='0' && str[j]<='9'){
                int_part=int_part*10+(str[j]-'0');
                }
                j++;
            }
            stack[index++]=int_part;
            }
        }
        else{
            if(index<=0){
                printf("Stack Underflow\n");
                continue;
            }
            else{
                printf("%d\n",stack[index-1]);
                index--;
            }
        }
    }
}

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

    process_stack(n);
    return 0;
}

Solving Approach

simple conversion and stack concepts helped me to solve the problem