write a program that performs an arithmetic sequence summation (arithmetic series).

C Programming Language Operators and Enums in C Language (Article) Operators and Enums in C Language (Program)

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Program:

#include<stdio.h> 
int main(){

float n, a1, an, d;
float sn;


printf("Enter how many term: ");
scanf("%f",&n);
printf("Enter first term: ");
scanf("%f",&a1);
printf("Enter last term: ");
scanf("%f",&an);
 

sn = (n*(a1+an))/2;

printf("summation: %f \n", sn);

}

Output:

Enter how many term: 41
Enter first term: 1
Enter last term: 101
summation: 2091.000000
Press any key to continue . . .

Explanation:

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