c - Scroll through 1d array and change specific values -

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my question following. want scroll through 1-d array, check values 4th,5th,8th,9th aka: 0+4*n , 3+4*n. check if value of field 0 , if yes make 1 , stop. if not 0, go next value (0+4*n or 3+4*n) , make 1 , stop. , on.. have done far following. problem updates many values @ once..

        {         (i=0; i<nr; i++)         {   (n=0; n<((nr)/4); n++)             if (i==(0+(n*4)))             {                 if (array[i]==0)                 {                     array[i]=1;                     break;                 }             }             else if ((i==(3+(n*4))))             {                 if (array[i]==0)                 {                     array[i]=1;                     break;                 }             }         }         }

what doing wrong, , doesn't stop updates values @ once?

your interpretation incorrect: 4th, 5th, 8th, 9th etc. correspond 4*n , 4*n+1, not 4*n+3

here modified , simplified code:

    (i = 0; < nr; i++) {         if (i % 4 <= 1) {             if (array[i] == 0) {                 array[i] = 1;                 break;             }         }     }

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