Objective-C programming [closed]

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Almost certainly you have:

Thing account1[6] = { ... };
for (i = 0; i <= 6; i++)    
{  
    if ([user1 isEqualToString:account1[i].name])

and the compiler knows that <= 6 will go beyond the bounds of the array (last index is 5 not 6).

To correct:

for (i = 0; i < 6; i++)
              ^

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