C语言函数计算x^2-2x+6的值：代码解析与答案

#include 'stdio.h'

float fun(float x) { float y; y = x * x - 2 * x + 6; return y; }

int main() { float x, y1, y2; scanf("%f", &x); y1 = fun(x - 1); y2 = fun(x + 1); printf("y1=%f, y2=%f ", y1, y2); }

答案：

1. float fun(float x);
2. return y;
3. x - 1
4. x + 1