Convert a string into a double
#include <stdlib.h> double atof( const char* ptr );
libc
Use the -l c option to qcc to link against this library. This library is usually included automatically.
The atof() function converts the string pointed to by ptr to a double. Calling it is equivalent to calling strtod() like this:
strtod( ptr, (char**)NULL )
The converted double, or 0.0 if an error occurs.
If an error occurs, errno is set to ERANGE.
#include <stdlib.h> #include <stdio.h> int main( void ) { double x; x = atof( "3.1415926" ); printf( "x = %f\n", x ); return EXIT_SUCCESS; }
Safety: | |
---|---|
Cancellation point | No |
Interrupt handler | No |
Signal handler | No |
Thread | Yes |