0_0_16228354_19636.cpp: In function 'int main()': 0_0_16228354_19636.cpp:26:3: error: '_Bool' was not declared in this scope _Bool isNegative; ^ 0_0_16228354_19636.cpp:30:5: error: 'isNegative' was not declared in this scope isNegative = 0; ^