Home/ Questions/error: ‘for’ loop initial declarations are only allowed in c99 mode. How to handle it?
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Chelsie Macejkovic
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Asked: 2022-07-04T11:48:10+00:00 In:

error: ‘for’ loop initial declarations are only allowed in c99 mode. How to handle it?

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Does anyone know the cause of the error: ‘for’ loop initial declarations are only allowed in c99 mode? I’m really not good at programming and I don’t know where my command is wrong.

Help me! Please tell me the solution. I really appreciate everyone’s help. Thanks in advance.

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    Expert

    The cause: The error: ‘for’ loop initial declarations are only allowed in c99 mode due to the fact that gcc’s for loop immediately initializes the variable i.

    for(int i=0; i<len; i++) {

}

    Solution: The code must be modified. First, you must specify the variable i.

    int i;
 for(i=0;i<len;i++){
 }

    Alternately, use C99 to declare the i variable in the for loop: gcc src.c -std=c99 -o src

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