C Exercises: Perfect numbers in a given range
C Function : Exercise-10 with Solution
Write a program in C to print all perfect numbers in given range using the function.
Pictorial Presentation:
Sample Solution:
C Code:
#include <stdio.h>
/* Function declarations */
int checkPerfect(int n1);
void PerfectNumbers(int stLimit, int enLimit);
int main()
{
int stLimit, enLimit;
printf("\n\n Function : perfect numbers in a given range :\n");
printf("--------------------------------------------------\n");
printf(" Input lowest search limit of perfect numbers : ");
scanf("%d", &stLimit);
printf(" Input highest search limit of perfect numbers : ");
scanf("%d", &enLimit);
printf("\n The perfect numbers between %d to %d are : \n", stLimit, enLimit);
PerfectNumbers(stLimit, enLimit);
printf("\n\n");
return 0;
}
// Checks whether the given number is perfect or not.
int checkPerfect(int n1)
{
int i, sum;
sum = 0;
for(i=1; i<n1; i++)
{
if(n1 % i == 0)
{
sum += i;
}
}
// If sum of proper positive divisors equals to given number
// then the number is perfect number
if(sum == n1)
return 1;
else
return 0;
}
void PerfectNumbers(int stLimit, int enLimit)
{
/* print perfect numbers from start to end */
while(stLimit <= enLimit)
{
if(checkPerfect(stLimit))
{
printf(" %d ", stLimit);
}
stLimit++;
}
}
Sample Output:
Function : perfect numbers in a given range : -------------------------------------------------- Input lowest search limit of perfect numbers : 1 Input highest search limit of perfect numbers : 100 The perfect numbers between 1 to 100 are : 6 28
Flowchart:
C Programming Code Editor:
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C Programming: Tips of the Day
Static variable inside of a function in C
The scope of variable is where the variable name can be seen. Here, x is visible only inside function foo().
The lifetime of a variable is the period over which it exists. If x were defined without the keyword static, the lifetime would be from the entry into foo() to the return from foo(); so it would be re-initialized to 5 on every call.
The keyword static acts to extend the lifetime of a variable to the lifetime of the programme; e.g. initialization occurs once and once only and then the variable retains its value - whatever it has come to be - over all future calls to foo().
Ref : https://bit.ly/3fOq7XP
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