【C语言】编写函数实现库函数atoi，把字符串转换成整形

//编写函数实现库函数atoi，把字符串转换成整形#include <stdio.h>#include <string.h>int my_atoi(const char *src){int flag=1;int sum=0;while (*src){if (*src == ' ')src++;else if (*src == '+'){src++;flag = 1;}else if(*src == '-'){src++;flag = -1;}else if(*src >= '0'&&*src <= '9'){sum = sum * 10 + (*src - '0');src++;}else{return 0;}}sum = sum*flag;return sum;}int main(){printf("%d\n", my_atoi(" +12345"));printf("%d\n", my_atoi(" -12345"));printf("%d\n", my_atoi("+12345"));printf("%d\n", my_atoi("-12345"));printf("%d\n", my_atoi("123  45"));printf("%d\n", my_atoi("234  5"));printf("%d\n", my_atoi(""));printf("%d\n", my_atoi("123ab"));return 0;}