error: 'for' loop initial declarations are only allowed in C99 mode
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error: 'for' loop initial declarations are only allowed in C99 mode
分类: linux2012-12-14 17:29 2454人阅读 评论(0) 收藏 举报
使用gcc编译代码是报出
error: 'for' loop initial declarations are only allowed in C99 mode
note: use option -std=c99 or -std=gnu99 to compile your code
错误,这是因为在gcc中直接在for循环中初始化了增量:
- for(int i=0; i<len; i++) {
- }
这语法在gcc中是错误的,必须先先定义i变量:
- int i;
- for(i=0;i<len;i++){
- }
这是因为gcc基于c89标准,换成C99标准就可以在for循环内定义i变量了:
gcc src.c -std=c99 -o src
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