double number, sum = 0.0;

for(i=1; i <= 10; ++i)
{
printf("E a n%d: ",i);

scanf("%lf",&number);

// \f user enters negative number, loop is terminated
if(number < 0.0)
{

sum += number; // sum = sum + number;

printf("Sum = %.2If",sum);

break; }

return 0;

}
Output

Enter 311: 2.4
Enter 312: 4.5
Enter 313: 3.4
Enter a ‏:4م‎ -3
Sum = 10.30

2. scanf() and printf() functions functions printf() and scanf(), which are used to display output
on screen and to take
input from user respectively.In general terms, the scanf function is written as:

scanf(control string, 3181, arg2,......... வதிய

where control string refers to a string containing certain required formatting information, and
arg1,arg2,....,argN are arguments that represent the individual data items.

getchar() & putchar() functions