c语言课件上出现的题目.docxVIP

顺序结构：1，交换顺序#includestdio.hvoid main(){int a=1,b=3,x;x=a;a=b;b=x;printf(%d\n%d,a,b);}2，计算圆的周长#include stdio.h/*程序功能：根据输入的半径，输出圆的周长*/void main(){ float r, cir; /* 定义实数变量*/ scanf( %f ,r); /* 从键盘输入变量r的值*/ cir =2 *3.14* r; /* 计算周长 */ printf(circumference = %f\n , cir); /* 输出周长*/}3，计算圆的面积#include stdio.hvoid main(){ float a,b,h,area; printf( please input a,b,h: ); scanf(%f%f%f, a, b, h); area= (a+b)*h/2; printf( area=%f\n, area);}4，大小字符的转换#include stdio.hvoid main(){ char lower,upper; printf(“please input an lowercase:”); lower=getchar(); /*从键盘上输入一个字符，并赋值给lower */ upper=lower-32; printf(“after transform,it is ”); putchar(upper); /*将upper输出 */}循环5，求班级平均成绩方法一（for）#include stdio.hvoid main( ){ int i,n; float sum,score, average=0.0; printf(\n n=?); scanf(%d,n); for(i=1;i=n;i++) {　printf(\n score=?); scanf(%f,score); /* 输入学生成绩 */ if(score0.0 || score100.0) /* 判断成绩的合法性 */ { printf(“the score you input is not between 0-100,please re-input! ”); i--; continue; } sum += score; /* 求成绩之和 */ } average = sum/n; /* 求平均成绩 */ printf(\n average =%f, average);}方法二（while）#include stdio.hvoid main( ){ int i,n; float sum,score, average=0.0; printf(\n n=?); scanf(%d,n); for(i=1;i=n;i++) {　printf(\n score=?); scanf(%f,score); /* 输入学生成绩 */ while(score0.0 || score100.0)/* 判断成绩的合法性 */ { printf(\n the score you input is not between 0-100,please re-input! ); scanf(%f,score); /* 输入学生成绩 */ } sum += score; /* 求成绩之和 */ } average = sum/n; /* 求平均成绩 */ printf(\n average =%f, average);}6，求一个数的逆序数#include stdio.hvoid main( ){ int k,n=0; printf(k=?); scanf(%d,k); printf(\n); do { n++; /* 计数器n加1，下边要计算倒数第n位*/ printf(“%d”,k%10); /* 求倒数第n位并输出*/ k/=10; /* 为下一次循环做准备*/ } while(k0); printf(\n n=%d,n);}7，计算求1!+2!+…+n!#include stdio.hmai