code

#include<stdio.h>
#include<stdlib.h>

int main(){
    printf("%d\n", sizeof(int));
    printf("%d\n", sizeof(float));
    printf("%d\n", sizeof(char));

    // malloc
    int *ptr;
    ptr = (int *) malloc(5 * sizeof(int));

    for(int i = 0; i < 5; i++){
        scanf("%d", &ptr[i]);
    }

    for(int i = 0; i < 5; i++){
        scanf("number %d = %d\n", i + 1, &ptr[i]);
    }

    // calloc
    int *ptr = (int *) calloc(5, sizeof(int));

    for(int i = 0; i < 5; i++){
        printf("number %d = %d\n", i+1, ptr[i]);
    }

    free(ptr);

    return 0;
}