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Not checking return values in C - Qomplainerz - 07-26-2023 Neglecting to check the return values of functions that can fail (e.g., malloc, fopen, etc.) can lead to errors. // Incorrect FILE *file = fopen("non_existent_file.txt", "r"); // No check for the success of fopen() // Correct FILE *file = fopen("non_existent_file.txt", "r"); if (file == NULL) {     // Handle error (file not opened) }