如何获取strtok（）返回十进制数字而不是整数？

Question

I have a function that reads in a file and prints it out as a grid.

This is the file (input):

2 2
1.83 5.64
7.36 4.10

But when it prints out the matrix it only returns whole numbers (output):

2 2
    1.00     5.00 
    7.00     4.00 

How do I get the function to print out the decimal number?

Wanted Output (ie):

2 2
    1.83     5.64 
    7.36     4.10 

Answer 1

Your problem isn't strtok , it's this:

double newVal = strtol(value, &ptr, 10);

strtol converts the string to a long , not a double , so it's discarding the fractional portion. Use strtod instead:

double newVal = strtod( value, &ptr );