C语言 C char* 到 int 的转换

C char* to int conversion

提问by Niek

How would I go about converting a two-digit number (type char*) to an int?

我将如何将两位数（类型char*）转换为int？

回答by Aamir

atoican do that for you

atoi可以为您做到

Example:

例子：

char string[] = "1234";
int sum = atoi( string );
printf("Sum = %d\n", sum ); // Outputs: Sum = 1234

回答by Omkant

Use atoi() from <stdlib.h>

使用 atoi() 从 <stdlib.h>

http://linux.die.net/man/3/atoi

http://linux.die.net/man/3/atoi

Or, write your own atoi()function which will convert char*to int

或者，编写您自己的atoi()函数，该函数将转换char*为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;
}