#include <stdio.h>
#include <stdlib.h>
struct hold {
   int age;
   char name[30];
};
void all(){
    struct hold *ptr;
    int i, n;
    printf("Enter the number of persons: ");
    scanf("%d", &n);
    ptr = (struct hold*) malloc(n * sizeof(struct hold));
    for(i = 0; i < n; ++i){
        printf("Enter first name and age respectively: ");
        scanf("%s %d", (ptr+i)->name, &(ptr+i)->age);
    }
    printf("Displaying Information:\n");
    for(i = 0; i < n; ++i)
        printf("Name: %s\tAge: %d\n", (ptr+i)->name, (ptr+i)->age);
}
int main(){
    int type;
    printf("Enter type: ");
    scanf("%d", type);
    switch(type){
        case '1':
            all();
    }
}