class Solution { public: bool isNum(char *ch) { if(*ch<='9'&&*ch>='0') return true; else return false; } bool isNumeric(char* string) { if(string==NULL) return false; if(*string=='+'||*string=='-') string++; if(*string==' ') return false; while(*string!=' ') { if(*string=='.'||*string=='e'||*string=='E') break; else if(isNum(string)) string++; else return false; } if(*string=='.') { string++; while(*string!=' ') { if(isNum(string)) string++; else if(*string=='e'||*string=='E') break; else return false; } } if(*string=='e'||*string=='E') { string++; if(*string==' ') return false; if(*string=='+'||*string=='-') string++; if(*string==' ') return false; while(*string!=' ') { if(isNum(string)) string++; else return false; } } return true; } };