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Ques:-15) Write a program to print out all Armstrong numbers between 1 to 500. If sum of cubes of each digit of the number is equal to the number itself, then the number is called an Armstrong number. For example, 153 = (1*1*1) + (5*5*5) + (3*3*3).
here is a C program that prints all Armstrong numbers between 1 and 500:
#include<stdio.h>
#include<conio.h>
int main()
{
clrscr();
int op,temp,last,i;
printf("Armstrog number is:\n");
for(i=1;i<=500;i++)
{
op=0;
temp=i;
while(temp>0)
{
last=temp%10;
temp=temp/10;
op=op+last*last*last;
}
if(op==i)
{
printf("%d\n",i);
}
}
getch();
}
Out Put
Armstrong numbers
1
153
370
371
470
Another Example
#include <stdio.h>
#include <math.h>
// Function to check if a number is an Armstrong number
int isArmstrong(int num) {
int originalNum, remainder, result = 0;
originalNum = num;
while (originalNum != 0) {
remainder = originalNum % 10;
result += pow(remainder, 3);
originalNum /= 10;
}
// If the result is equal to the number, it is an Armstrong number
if(result == num) {
return 1;
}
return 0;
}
int main() {
printf("Armstrong numbers between 1 and 500 are:\n");
for(int i = 1; i <= 500; i++) {
if(isArmstrong(i)) {
printf("%d\n", i);
}
}
return 0;
}
Explanation:
isArmstrong Function:
- This function takes an integer as input and checks if it is an Armstrong number.
- It calculates the sum of the cubes of its digits and checks if this sum is equal to the original number.
Main Function:
- The
mainfunction iterates through all numbers from 1 to 500. - For each number, it calls the
isArmstrongfunction to check if it is an Armstrong number. - If the number is an Armstrong number, it prints the number.
- The
Output:
When you run this program, it will print all Armstrong numbers between 1 and 500. The expected output is:
Armstrong numbers between 1 and 500 are:
1
153
370
371
407
