Prime or perfect number program in C - c

Question

I've made a program that checks if a given positive integer is a prime or perfect number.The problem I'm facing is I created a function "readNumber" that works as a check loop to ensure that input is a positive integer.But if I enter a negative value and then an acceptable one it shows previous values aswell.I attach a screenshot of the command prompt text to make myself more clear.
Below is my code
#include<stdio.h>
int checkperfectnumber(int);
int checkprimenumber(int);
int readNumber(int);
int main(){
int num, x, y, result;
printf("\nGive a positive integer number: \n");
scanf("%d",&num);
y = readNumber(num);
x = checkperfectnumber(num);
result = checkprimenumber(num);
if (num == 1)
printf("1 is nor a prime neither a perfect number");
else if (x == num)
printf("%d is a perfect number\n",num);
else if ( result == 1 )
printf("%d is a prime number.\n", num);
else
printf("%d is nor prime neither a perfect number.\n", num);
return 0;
}
//perfect number function
int checkperfectnumber(int numbr){
int a=1, sum=0;
while(a < numbr){
if(numbr % a == 0)
sum=sum+a;
a++;
}
return(sum);
}
//prime number function
int checkprimenumber(int a)
{
int c;
for ( c = 2 ; c <= a - 1 ; c++ )
{
if ( a%c == 0 )
return 0;
}
return 1;
}
//input check function
int readNumber(int b){
while (b < 0)
{
printf("Wrong input.\nPlease insert a positive integer.");
main();
break;
}
}

Answer 1

Quick fix is have the program exit after executing main() from readNumber().
To do this, Add #include <stdlib.h> and replace break; in the function readNumber() to exit(0);.
Better solution is having the function readNumber(), not main(), read numbers and stop calling main() recursively.
It will be like this:
#include<stdio.h>
int checkperfectnumber(int);
int checkprimenumber(int);
int readNumber(void);
int main(){
int num, x, y, result;
printf("\nGive a positive integer number: \n");
num = readNumber();
x = checkperfectnumber(num);
result = checkprimenumber(num);
if (num == 1)
printf("1 is nor a prime neither a perfect number");
else if (x == num)
printf("%d is a perfect number\n",num);
else if ( result == 1 )
printf("%d is a prime number.\n", num);
else
printf("%d is nor prime neither a perfect number.\n", num);
return 0;
}
//perfect number function
int checkperfectnumber(int numbr){
int a=1, sum=0;
while(a < numbr){
if(numbr % a == 0)
sum=sum+a;
a++;
}
return(sum);
}
//prime number function
int checkprimenumber(int a)
{
int c;
for ( c = 2 ; c <= a - 1 ; c++ )
{
if ( a%c == 0 )
return 0;
}
return 1;
}
//input check function
int readNumber(void){
for (;;)
{
int b;
scanf("%d",&b);
if (b >= 0) return b; /* 0 is not positive, but this condition is !(b < 0) */
printf("Wrong input.\nPlease insert a positive integer.");
}
}