please help to find my mistek

Question

here is a simple code of c language, it is about malloc,calloc and realloc. the last two for loop are not working properly, I am not getting any error massage from compiler please help me to find my mistek

here is a code:

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

void main()
{
int *m,*o,n,i,p,v;

m=(int*)malloc(sizeof(int)*n);
printf("how many number you wanna add(malloc):\n");
scanf("%d",&n);

printf("enter the number:\n");
for(i=0;i<n;i++)
{
scanf("%d",&m[i]);
}
for(i=0;i<n;i++)
{
printf("%d",m[i]);
}
free(m);

printf("\n_______________\n\n");

o=(int*)calloc(v,sizeof(int));
printf("how many number you wanna add(calloc):\n");
scanf("%d",&v);

printf("enter the number:\n");
for(i=0;i<v;i++)
{
scanf("%d",&o[i]);
}
for(i=0;i<v;i++)
{
printf("%d",o[i]);
}
free(o);

printf("\nenter the new size of malloc:\n");
scanf("%d",&p);
m=(int*)realloc(m,sizeof(int)*p);

if(p>n)
{
printf("add the numbers in malloc:\n");

for(i=0;i<p;i++)
{
scanf("%d",&m[i]);
}
}

for(i=0;i<p;i++)
{
printf("%d",m[i]);
}

free(o);

}

Answer 1

You should write this statements after giving the variables. (after scanf). Cause initial values of them are 0 so it may be a problem.

m=(int*)malloc(sizeof(int)*n)

o=(int*)calloc(v,sizeof(int))

I hope it works. Happy coding!

https://code.sololearn.com/c8Xx74zXjW0j/?ref=app