C Exercises: Calculate the sum of the series 1 +11 + 111 + 1111 + .. n terms
C For Loop: Exercise-26 with Solution
Write a program in C to find the sum of the series 1 +11 + 111 + 1111 + .. n terms.
Pictorial Presentation:
Sample Solution:
C Code:
#include <stdio.h>
void main()
{
int n,i;
long sum=0;
long int t=1;
printf("Input the number of terms : ");
scanf("%d",&n);
for(i=1;i<=n;i++)
{
printf("%ld ",t);
if (i<n)
{
printf("+ ");
}
sum=sum+t;
t=(t*10)+1;
}
printf("\nThe Sum is : %ld\n",sum);
}
Sample Output:
Input the number of terms : 5 1 + 11 + 111 + 1111 + 11111 The Sum is : 12345
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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