C char* to int conversion
Use atoi() from <stdlib.h>
http://linux.die.net/man/3/atoi
Or, write your own atoi() function which will convert char* to int
int a2i(const char *s){ int sign=1; if(*s == '-'){ sign = -1; s++; } int num=0; while(*s){ num=((*s)-'0')+num*10; s++; } return num*sign;}