Find the sum of first and last digit for a number using C language

The sum of first and last digit for a number can be calculated if we use the below mentioned algorithm in C programming language.

Algorithm

Refer an algorithm given herewith −

START
Step 1: Declare no, sum variables of type int
Step 2: Read a number at runtime
Step 3: Compute sum=no%10
Step 4: While loop no>9
   No=no/10
Step 5: Compute sum=sum+no;
Step 6: Print sum
STOP

Example

Following is the C program to find the sum of first and last digit for a number −

#include <stdio.h>
int main(){
   unsigned int no,sum;
   printf("enter any number:");
   scanf("%u",&no);
   sum=no%10;
   while(no>9){
      no=no/10;
   }
   sum=sum+no;
   printf("sum of first and last digit is:%d",sum);
   return 0;
}

Output

You will see the following output −

enter any number:1242353467
sum of first and last digit is:8

Following is a C program to calculate sum all elements in an array −

Example

#include<stdio.h>
void main(){
   //Declaring the array - run time//
   int array[5]={10,20,30,40,50};
   int i,sum=0,product=1;
   //Reading elements into the array//
   //For loop//
   for(i=0;i<5;i++){
      //Calculating sum and product, printing output//
      sum=sum+array[i];
   }
   //Displaying sum //
   printf("Sum of elements in the array is : %d\n",sum);
}

Output

You will see the following output −

Sum of elements in the array is : 150