the value of variable changes after the end of for loop

[Norgy]

    for (int raw1=0;raw1<4;raw1++){
 
        for (int column2=0;column2<4;column2++){
            unsigned char temp=0x00;
 
            for (column1=0;column1<4;column1++){
                int z1=7;
                int p1[8]={00000000};
 
                unsigned char temp2;
 
                u1 = output_substitute_byte1[column1][column2];
 
                while( u1!=0){
                p1[z1]=u1%2;
                 u1 = u1/2;
                z1--;
                }
 
    unsigned char k= output_substitute_byte1[column1][column2];
 
    if(mix_matrix[raw1][column1]==0x01){temp=temp^output_substitute_byte1[column1][column2];}
 
    else if(mix_matrix[raw1][column1]==0x02&&p1[0]==0)
    {
        temp2=output_substitute_byte1[column1][column2]<<1;
 
        temp=temp^temp2;
    }
 
    else if(mix_matrix[raw1][column1]==0x02&&p1[0]==1)
    {
        temp2=(output_substitute_byte1[column1][column2])<<1;
        temp2=temp2 ^ 0x1B;
        temp=temp^temp2;
    }
 
    else if(mix_matrix[raw1][column1]==0x03&&p1[0]==1)
    {    
        unsigned char temp3;
        temp3=output_substitute_byte1[column1][column2];
        temp2=output_substitute_byte1[column1][column2]<<1;
        temp2=temp2^temp3;
        temp2=temp2 ^0x1B;
        temp=temp^temp2;
    }
 
    else if(mix_matrix[raw1][column1]==0x03&&p1[0]==0)
    {    
        unsigned char temp3;
        temp3=output_substitute_byte1[column1][column2];
        temp2=output_substitute_byte1[column1][column2]<<1;
        temp2=temp2^temp3;
        temp=temp^temp2;
    }
}
 
  output_mix_column[column1][column2]=temp;
  printf("%0x\t",  output_mix_column[column1][column2]);
 
 }
}

when i print the variable output_mix_column inside the for loop as shown in the code, it prints the right output, but when i print it outside the for loop, it changes its value
i don't know where is the problem

[Luuk]

In c, when you do something like:

for (int column2=0;column2<4;column2++){

then the variable column2 is 'local' to the block that is defined after it or, in other word, the value of it is undefined after the for-loop.