# C program to check whether a number is Armstrong or not

### Definition of Armstrong Number

Those numbers which sum of the cube of its digits is equal to that number are known as Armstrong numbers. For example 153 since 1^3 + 5^3 + 3^3 = 1+ 125 + 9 =153 Other Armstrong numbers: 370,371,407 etc.

### General definition of ArmStrong Number:

Those numbers which sum of its digits to power of number of its digits is equal to that number are known as Armstrong numbers.

### Example 1:

153
Total digits in 153 is 3
And 1^3 + 5^3 + 3^3 = 1 + 125 + 27 = 153

### Example 2:

1634
Total digits in 1634 is 4
And 1^4 + 6^4 + 3^4 +4^4 = 1 + 1296 + 81 + 64 =1634

### Examples of Armstrong numbers:

1, 2, 3, 4, 5, 6, 7, 8, 9, 153, 370, 371, 407, 1634, 8208, 9474, 54748, 92727, 93084, 548834, 1741725

#include
int main(){
int num,r,sum=0,temp;
printf("Enter a number: ");
scanf("%d",&num);
temp=num;
while(num!=0){
r=num%10;
num=num/10;
sum=sum+(r*r*r);
}
if(sum==temp)
printf("%d is an Armstrong number",temp);
else
printf("%d is not an Armstrong number",temp);
return 0;
}

### C program for finding armstrong no in a given range

#include
int main(){
int num,r,sum,temp;
int min,max;
printf("Enter the minimum range: ");
scanf("%d",&min);
printf("Enter the maximum range: ");
scanf("%d",&max);
printf("Armstrong numbers in given range are: ");
for(num=min;num<=max;num++){
temp=num;
sum = 0;
while(temp!=0){
r=temp%10;
temp=temp/10;
sum=sum+(r*r*r);
}
if(sum==num)
printf("%d ",num);
}
return 0;
}

### C program for finding Armstrong number using for loop

#include
int main(){
int num,r,sum=0,temp;
printf("Enter a number: ");
scanf("%d",&num);
for(temp=num;num!=0;num=num/10){
r=num%10;
sum=sum+(r*r*r);
}
if(sum==temp)
printf("%d is an Armstrong number",temp);
else
printf("%d is not an Armstrong number",temp);
return 0;
}

### C program to print Armstrong numbers from 1 to 500

#include
int main(){
int num,r,sum,temp;
for(num=1;num<=500;num++){
temp=num;
sum = 0;
while(temp!=0){
r=temp%10;
temp=temp/10;
sum=sum+(r*r*r);
}
if(sum==num)
printf("%d ",num);
}
return 0;
}