If it is a string, it is char*, using atoi:

int atoi(char *str)

The string to be converted to an integer.

For example:

# include & ltstdlib.h & gt

# include & ltstdio.h & gt

int main(void)

{

int n；

char * str = " 12345.67 "；

n = atoi(str)；

printf("string = %s integer = %d "，str，n)；

Returns 0;

}