C语言编程：从键盘上输入一个正方体的棱长，计算并输出这个正方体的表面积和体积

数据类型不对，改为：#includedouble s1,s,v;double area(double x){ return 6*x;}double volume(double k){ return k*k*k;}double s2(double a){ return a*a;}int main(){ double a; scanf("%lf",&a); printf("%f\n",a); s1=s2(a); s=area(s1); printf("