函数定义正确的是 答案:int function ( int x ) { int y, z; y = x * x; z = y + 1; return z; }int function ( int x ) { return x * x + 1; }int function ( int x ) { int y; y = x * x * x + 2 * x; return y; }int function ( int x ) { int y; y = x * x * x + 2 * x; int z; z = y + 1; return z; }