1》分解质因数的程序：#include<stdio.h>zhishu(x,y){int m=1;while(y%x==0){if(y%x==0)y=y/x;if(y%x==0)m++;}printf("^%d x ",m);}sushu(j){int n,m=0;for(n=2;n<j;n++)if(j%n!=0)m++;if(m==j-2)return 1;elsereturn 0;}void main(){int a,i;printf("请输入一个整数:");scanf("%d",&a);printf("\n整数%d可分解为：\n",a);for(i=2;i<=a/2;i++)if(a%i==0&&sushu(i)==1){printf("%d",i);zhishu(i,a);}printf("1^1\n\n");}2》看你的星座的程序：#include<stdio.h>void main(){int m,d;float s;printf("请输入你的生日（月、日）：\n");scanf("%d",&m);scanf("%d",&d);if(m>12||m<1||d>31||d<1)printf("你输入的生日错误！");if(m>=1&&m<=12&&d>=1&&d<=31);{s=(float)(m+d/100);if(s>=3.21&&s<=4.20)printf("你的星座是：白羊座");else if(s>=4.21&&s<=5.20)printf("你的星座是：金牛座");else if(s>=5.21&&s<=6.21)printf("你的星座是：双子座");else if(s>=6.22&&s<=7.22)printf("你的星座是：巨蟹座");else if(s>=7.23&&s<=8.22)printf("你的星座是：狮子座");else if(s>=8.23&&s<=9.22)printf("你的星座是：处女座");else if(s>=9.23&&s<=10.23)printf("你的星座是：天秤座");else if(s>=10.24&&s<=11.21)printf("你的星座是：天蝎座");else if(s>=11.22&&s<=12.21)printf("你的星座是：射手座");else if((s<=12.31&&s>=12.22)||(s<=1.19&&s>1.00))printf("你的星座是：摩羯座");else if(s>=1.20&&s<=2.18)printf("你的星座是：水瓶座");else if(s>=2.19&&s<=3.20)printf("你的星座是：双鱼座");elseprintf("ERRORS!OUT OF MY EXPECTATION!");}printf("\n\n");}3》天干地支年的计算：#include<stdio.h>void main(){int a,i,j;printf("请输入公历年份：");scanf("%d",&a);i=(a-3)%10;j=(a-3)%12;printf("%d年是",a);switch(i){case 1: printf("甲");break;case 2: printf("乙");break;case 3: printf("丙");break;case 4: printf("丁");break;case 5: printf("戊");break;case 6: printf("己");break;case 7: printf("庚");break;case 8: printf("辛");break;case 9: printf("壬");break;case 0: printf("癸");break;}switch(j){case 1:printf("子鼠");break;case 2:printf("丑牛");break;case 3:printf("寅虎");break;case 4:printf("卯兔");break;case 5:printf("辰龙");break;case 6:printf("巳蛇");break;case 7:printf("午马");break;case 8:printf("未羊");break;case 9:printf("申猴");break;case 10:printf("酉鸡");break;case 11:printf("戌狗");break;case 0:printf("亥猪");break;}printf("年\n\n");}4》大学生一门课的成绩（人大）：#include<stdio.h>void main(){ int a,b;double s,GPA;printf("请输入期末考试的成绩：");scanf("%d",&a);printf("请输入平时课业的成绩：");scanf("%d",&b);if(a<=55&&a>=0)s=(double)a;else if(a>55&&a<=100)s=(double)0.6*a+(double)0.4*b;elseprintf("输入不正确！");printf("该学生的这门课的总成绩为：%.2lf\n",s);if(s>=90&&s<=100)GPA=(double)4.0;else if(s>=86&&s<90)GPA=(double)3.7;else if(s>=83&&s<86)GPA=(double)3.3;else if(s>=80&&s<83)GPA=(double)3.0;else if(s>=76&&s<80)GPA=(double)2.7;else if(s>=73&&s<76)GPA=(double)2.3;else if(s>=70&&s<73)GPA=(double)2.0;else if(s>=66&&s<70)GPA=(double)1.7;else if(s>=63&&s<66)GPA=(double)1.3;else if(s>=60&&s<63)GPA=(double)1.0;elseGPA=(double)0.0;printf("该学生的GPA是：%.1lf\n",GPA);if(GPA>=1.0)printf("该学生及格了！\n\n");elseprintf("该学生不及格！\n\n");}5》求大学生一门课成绩的算法（武大）：#include<stdio.h>void main(){int a,b;double s,GPA;printf("请输入期末考试的成绩：");scanf("%d",&a);printf("请输入平时课业的成绩：");scanf("%d",&b);if(a<=55&&a>=0)s=(double)a;else if(a>55&&a<=100)s=(double)0.6*a+(double)0.4*b;elseprintf("输入不正确！");printf("该学生的这门课的总成绩为：%.2lf\n",s);if(s>=96&&s<=100)GPA=(double)4.3;else if(s>=90&&s<96)GPA=(double)4.0;else if(s>=85&&s<90)GPA=(double)3.7;else if(s>=80&&s<85)GPA=(double)3.3;else if(s>=75&&s<80)GPA=(double)3.0;else if(s>=70&&s<75)GPA=(double)2.7;else if(s>=67&&s<70)GPA=(double)2.3;else if(s>=63&&s<67)GPA=(double)2.0;else if(s>=60&&s<63)GPA=(double)1.7;elseGPA=(double)1.0;printf("该学生的GPA是：%.1lf\n\n",GPA);}6》判断你胖不胖：#include<stdio.h>void main(){float a,b;double i,j;printf("请输入你的体重（kg）：");scanf("%f",&a);printf("请输入你的身高（m）：");scanf("%f",&b);i=a/b;j=i/b;printf("你的体质指数是:%.2f\n",j);if(j<14)printf("你已经瘦得不成样子了！！");else if(j<18.5&&j>=14)printf("你比较瘦了！");else if(j>=18.5&&j<24)printf("你很健康！");else if(j>=24&&j<28)printf("你只是稍微胖些。