Why doesn't this expression work properly?

Question

When I am giving expression as current,it gives wrong answer.But When giving expression like commented out expression.Then it gives correct result.Why don't current expression work properly?
https://code.sololearn.com/cQ75957wPhfS/?ref=app

Answer 1

1st one total = salary+(sale*(15/100)) ;

(15/100) is done first since 15 and 100 are int, the result of that division is 0
so total will be salary + (sale * 0)

2nd one total = salary+((sale*15)/100);

(sale * 15) is done first which will give a double since sale is a double. double/100 will result in a correct division instead of 0.

Answer 2

// Convert int to double

total = salary+(sale*((double)15/100));

//or

total = salary+(sale*0.15);

// Good Luck

Answer 3

SoloProg could you tell me the cause?

Answer 4

sry, i don't know anything about C, but i think it can't convert int to double, i'm not sure, i dont know :v

double sale,salary,total;
scanf("%lf %lf",&salary,&sale);
total = salary+(sale*0.15);
printf("SALARY = %.2lf \n",salary);
printf("SALE = %.2lf \n",sale);
printf("TOTAL = %.2lf",total);
return total;