Atof () function in C

The double atof function (const char * str) in Standard C Library converts a string pointed to by parameter str to a floating point number (type double).

Declare atof () function in C

Below is the declaration for the atof () function in C:

 double  atof ( const char * str ) 

Parameters

str - This is a string with a representation of a floating point number.

Returns the value

This function returns the floating point number that was converted as a double value. If no valid conversion is performed, it returns 0.0.

For example

The following C program illustrates the usage of the atof () function in C:

 #include #include #include int  main () { float  val ; char  str [ 20 ];  strcpy ( str , "98993489" );  val  =  atof ( str );  printf ( "Gia tri duoi dang chuoi = %s, nGia tri duoi dang so thuc = %fn" ,  str ,  val );  strcpy ( str , "QTM.com" );  val  =  atof ( str );  printf ( "nGia tri duoi dang chuoi = %s, nGia tri duoi dang so thuc = %fn" ,  str ,  val ); return ( 0 ); } 

Compile and run the above C program to see the results.

According to Tutorialspoint

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