给定函数y=x 用c语言,求y的不定积分. 要写出相应的c语言程序.答:float f2(float);float f3(float);float f4(float);float f5(float);float integral(float,float,float(*fun)(float));float a,b;int i;float k[5];printf("enter a,b:\n"); scanf("%f,%f",&a,&b); k[0]=integral(a,b,f1); k[1]=integral(a,b,f2); k[2]=integral(a,b...