我在for循环中收到错误

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I am having errors in my for loop and I wonder why is that:

for (int i = 0; char a = 'a'; i < n; i++; a++)

substitution.c:24:25: error: expected expression
        for (int i = 0; char a = 'a'; i < n; i++; a++)
                        ^
substitution.c:24:44: error: expected ')'
        for (int i = 0; char a = 'a'; i < n; i++; a++)
                                           ^
substitution.c:24:13: note: to match this '('
        for (int i = 0; char a = 'a'; i < n; i++; a++)
            ^
substitution.c:24:46: error: use of undeclared identifier 'i'
        for (int i = 0; char a = 'a'; i < n; i++; a++)
                                             ^
substitution.c:24:51: error: use of undeclared identifier 'a'
        for (int i = 0; char a = 'a'; i < n; i++; a++)
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  • kquam
    kquam 回复

    A for loop has the form

    for(initializer; incrementor; test)
{
       }

    因此，只有两个分号。三个部分（初始化程序，增量程序，测试）中的表达式以逗号分隔。