c++ validation help please !!!?

Question

i am shamed to ask . umm please could someone give me a function that can check a string if it have only numbers or only litters and if it does take any parameters , i really can't remember any one now !

and i need a function that can convert a string to integers please .

many thanks for you all

Answer 1

for conversion use the stdlib.h libraary it has a function called atoi()

prototype
int atoi ( const char * string );


for digit checking


header ctype.h

prototype
int isdigit(int Character);

good luck

Answer 2

use inbuilt function defined in string.h