7.6 提取text.txt文件内容，进行文本等号以后求和

 1 //提取text.txt文件内容，进行文本等号以后求和
 2 #include <stdio.h>
 3 #include <stdlib.h>
 4 #define F_PRINT_ERR(e) 5 do 6 { 7     if(e == NULL) 8     { 9       printf("open error");10       exit(-1);11     }12 }13 while(0)
14 int main(void)
15 {
16 
17     FILE* pf = fopen("G:/qtcode/text.txt","r");
18     F_PRINT_ERR(pf);
19 
20     char buf[1024];
21     char* p = buf;
22     int value,sum = 0;
23 
24     while(fgets(buf,1024,pf))
25     {
26         printf("%s",buf);
27 
28         p = buf;
29         while(*p++ != ‘=‘);//遍历到每行里的等号之后第一个位置
30 
31         value = atoi(p);
32         sum += value;
33     }
34 
35     printf("sum = %d\n",sum);
36     fclose(pf);
37 
38     return 0;
39 }