C语言实验报告英文版（3）.docxVIP

SouthWest University Lab report Couse name C programming Semester 2019 - 2020 - 2 Grade 2019 class Software Engineering 3 School of Computer and Information Science  Lab 3 Practicing on functions Issue Date 2020年3月30日 experimental types □validation experiment, □comprehensive experiment ?design experiment Goal ? You will practice using functions Assignment 1.Write a program that can take three integers as the sides of a triangle and output the circumference and area of this triangle. (use two user-defined functions to implement the calculation of circumference and area of a triangle separately. 2 Write a program that can find the root of the equation ax2+bx+c=0. (using at least one user-defined functions to complete the task.) 3.Write a function lcm() that takes two integer arguments and returns their lcm. The lcm() function should calculate the least common multiple by calling the gcd() function. gcd is a function that can take two integer arguments and return their greatest common divisor. lcm(u,v)=uv/gcd(u,v) u,v=0 4. Write a program to output the first n numbers of a Fibonacci series by using recursive calling. experimental contents and process Analyze what the problems say, and understand what it means. Clear object procedure. Compilation object process. Make the program functional. screen shots of the VC++ or other IDE for C(Dev c++，VS2010. etc)showing the output results of running your Lab code. Ex1： Ex2： Ex3： Ex4： Lab Code Ex1： #include stdio.h #define PI 3.14159265358979323846 double area(double r) { return r * r * PI; } double circum(double r) { return 2 * PI * r; } int main (void) { double r; scanf(%lf, r); printf(circumference:%.2lf\n, circum(r)); printf(area:%.2lf, area(r)); return 0; } Ex2： #include stdio.h #include math.h int judge(double x) { if (fabs(x) - 1E-8 = 0) return 1; return 0; } double calc(double a, double b, double c) { double delta; delta = b * b - 4 * a * c; if (judge(a) judge(b) judge(c)) { printf(Zero