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• How to avoid overflow in expr. A * B - C * D

  - by Ir0nm

  I need to compute an expression which looks like: A*B - C*D, where their types are: signed long long int A, B, C, D; Each number can be really big (not overflowing its type). While A*B could cause overflow, at same time expression A*B - C*D can be really small. How can I compute it correctly? For example: MAX * MAX - (MAX - 1) * (MAX + 1) == 1, where MAX = LLONG_MAX - n and n - some natural number.

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• Dynamical array of strings in C

  - by Ir0nm

  I'm trying to make array of strings, I have function rLine which reads line from stdin, each inputted line I need to save in array, but I don't have any idea about number of inputted string lines. So I need to dynamically increase array size to store them, I wrote such code: char *res[2], *old = res; while( 1 ){ line = rLine( stdin ), len = strlen( line ); res[row] = (char*)malloc( len + 1); strcpy( res[row++], line); res = (char**) realloc( res, row ); /* adding 1 more row, not sure adding size row? */ if ( /*some cond*/ ) break; } But this code doesn't seem to work, how correctly declare array and increase it size?

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