#include <stdio.h>
int main()
{
int i, num, sum=0;
// Reading number
printf("Enter any number: ");
scanf("%d", &num);
for(i=1; i<=num; i+=2)
{
//Adding current odd number to sum variable
sum += i;
}
printf("Sum of all odd number between 1 to %d: %d", num, sum);
return 0;
}

Result:Enter any number: 10

Sum of all odd number between 1 to 10: 25

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