vc中如何利用数组将字符串转换为整型

atoi()函数
double atof( const char *string );

int atoi( const char *string );

__int64 _atoi64( const char *string );

long atol( const char *string );

char s[100];
sprintf(s,"123");
int k;
int i=0;
while (s[i])
{
switch (s[i])
{
case 1:
k=k*10+1;
....
}

}