A c program to generate a series of 1 3 6 10 15 21.?

Answer 1

As you can see, this series is the sum of the sequence: 1, 2, 3, 4, 5, 6.

That is to say:

1 + 2 = 3

3 + 3 = 4

6 + 4 = 10

10 + 5 = 15

15 + 6 = 21

To program this in C, you would want a simple incremental counter which would be added to the series sum on each iteration of the loop.

{

int c = 2;

int sum = 1;

// loop until you find all the numbers you want

while(1) {

// increase the running sum to find the next next number in the series

sum += c;

// increment our counter

++c;

}

}

Answer 2

#include
main()
{
int i,j;
for(i=0;i<=3;i++)
{
for(j=1;j<=i+1;j++)
printf("%d",j+i);
printf(" ");
}
printf("\n");
return 0;
}