codeblocks gcc error: 'for' loop initial declarations are only allowed in C99 mode|
2015-03-14 22:38
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源代码
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:
#include <stdio.h> #include <stdlib.h> int main() { for(int i=0; i<1600; i=i+20) { int c; c = 5*(i-32)/9; printf("%d \t %d\n",i,c); } return 0; }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++){ }
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