[Solved] How to transform the digits of a number?

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Your logic of result*=devided; is wrong. You need to add the digit(multiplied by it’s 10’s place) to the result. Here is the solution to your problem.

int function (int *n, int i){
    int temp=n[i]; //tepmorary veraible of the passed number
    int result=0;
    int mult=1;
    int devided;
    while (temp!=0){
        devided=temp%10;//get the last number example 123 = 3;
        if (devided==9){ //if its 9 change the last didigt to 7
            devided=7;
        }
        result+=(devided * mult);//multiply the last didgit with 10
        temp/=10;
        mult*=10;
    }
    return result;
}

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solved How to transform the digits of a number?