I want the absolute-value from a negative double - and I thought the abs-function was as easy to use as in java - but NOT!
It seems that the abs-function returns an int because I have the value 3.8951 and the output is 3.000000
double d1 = abs(-3.8951);
printf("d1: ...%lf", d1);How can I fix this problem? That is - I want the absolute value of a double.
5 Answers
Use fabs() (in math.h) to get absolute-value for double:
double d1 = fabs(-3.8951);Use fabs instead of abs to find absolute value of double (or float) data types. Include the <math.h> header for fabs function.
double d1 = fabs(-3.8951);It's worth noting that Java can overload a method such as abs so that it works with an integer or a double. In C, overloading doesn't exist, so you need different functions for integer versus double.
I have found that using cabs(double), cabsf(float), cabsl(long double), __cabsf(float), __cabs(double), __cabsf(long double) is the solution
//use fabs() double sum_primary_diagonal=0; double sum_secondary_diagonal=0; double difference = fabs(sum_primary_diagonal - sum_secondary_diagonal);
