parameters conversion

[thomas3711]

Please someone help me convert argv from char/string to int, or float or any other numeric format...I need to write program which will be able to count with numbers inserted as parameters...thanks

 

[columb]

look at atoi, atol, atof

Typically

int i = atoi ( argv[1] );

Columb Healy
Living with a seeker after the truth is infinitely preferable to living with one who thinks they've found it.

 

[ArkM]

Be careful: cmd line parameter pointers are in argv[] as is i.e. if you call your app in Windows style

myexe /1

argv[1] is equal to "/1", not "1".
In that case you may find 1st digit in parameter value, for example:

static const char digits[] = "0123456789";
...
argv[i]+strcspn(argv[i],digits) /* argv[i] if no digits */

Don't forget: atoi(s) returns 0 if s is not a number...

 

[Hammer]

>>atoi(s) returns 0 if s is not a number...
Strictly speaking, the return value is undefined upon an error, not 0.

 

[ArkM]

Hammer,
alas, atoi() returns an undefined value in case of overflow only (may be because of most of CPUs do not report int overflow condition). The language Standard specifies that zero is returned value if atoi() can't convert its argument to number...