C语言编程题覆盖到的算法：1、个人所得税计算；2、求一组数的正、负数（或奇、偶数）的个数和平均值；3、二维数组主、次对角线之和；4、求素数（用函数实现）；5、级数有限项求和问题；6、两个一维数组相加（用函数实现）；7、求最大、最小值；8、判断闰年（用函数实现）；9、求水仙花数；10、百钱百鸡；11、求最大公约数、最小公倍数。12、求回文数；13、排序；14、二维数组的转置；15、递归函数求阶乘；16、求斐波那契数列；17、求和：a+aa+aaa+aaaa+....；18、求符合条件的整数（如：是某个二位数的平方，个位、十位、百位数各不相同等）；(包括素数，回文，完数，等等)19、字符串加密；20、统计字符串中字母和数字的个数；/*1.个人所得税计算，以实验指导P24T5为
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*/#include
voidmain(){inti,n;doublea,b,c;n=i/400;printf("pleaseinputincome:\n");scanf("%d",&i);a=(i-800)*0.05,b=20+(i-1200)*0.08,c=84+(i-2000)*0.2;switch(n){case0:case1:printf("不需缴税\n");break;case2:printf("需交纳%lf元\n",a);break;case3:case4:printf("需交纳%lf元\n",b);break;default:printf("需交纳%lf元\n",c);break;}}/*2.求一组数的奇数个数，偶数个数和平均值#include#defineN10voidmain(){inta[N];inti,m=0,n=0,sum=0;doubleaverage;printf("pleaseinput10numbers:\n");for(i=0;i#defineN10voidmain(){inta[N];inti,m=0,n=0,sum=0;doubleaverage;printf("pleaseinput10numbers:\n");for(i=0;i0)m++;elsen++;sum+=a[i];}average=(double)sum/N;printf("wehave%dpositivenumbersand%dnagetivenumbers\n",m,n);printf("theaverage=%lf",average);}/*3.求二维数组的主次对角线之和*/#include#defineM5#defineN5voidmain(){inta[M][N];inti,j,sum1=0,sum2=0;printf("pleaseinputthematrix:\n");for(i=0;i#includeintisPrime(intn){inti;for(i=1;i#includevoidmain(){intn=1;doublep=0,t,pi;t=1/(pow((-1),(n+1))*2*(n-1));while(fabs(t)>=1e-6){pi+=t;n++;}pi=4*p;printf("%lf",pi);}//6.两个一维数组相加///*#include#defineN5voidmain(){inta[N],b[N],c[N];inti;printf("pleaseinputthefirstarraya[N]:\n");for(i=0;i#defineN5intf(inta,intb){intsum;sum=a+b;returnsum;}voidmain(){inta[N],b[N],c[N];inti;printf("pleaseinputthefirstarraya[N]:\n");for(i=0;ivoidmain(){inti,max,min;inta[10];printf("pleaseinputtennumbers\n");for(i=0;i<10;i++){scanf("%d",&a[i]);}max=a[0];min=a[0];for(i=1;i<10;i++){if(a[i]>max){max=a[i];}if(a[i]#includevoidmain(){inti,max,min;inta[10];for(i=0;i<10;i++){a[i]=rand()%90+10;printf("%d\t",a[i]);}max=a[0];min=a[0];for(i=1;i<10;i++){if(a[i]>max)max=a[i];if(a[i]intf(intn){if(n%4==0&&n%100!=0||n%400==0)return1;elsereturn0;}voidmain(){intn;printf("pleaseinputyear:\n");scanf("%d",&n);if(f(n))printf("%d是闰年\n",n);elseprintf("%d不是闰年\n",n);}/*可能会有要输出某一围所有闰年，思想一样，用循环调用函数即可*//*9.判断水仙花数（运用循环）#includevoidmain(){intn,a,b,c,m;printf("pleaseinputanumber:\n");scanf("%d",&n);a=n/100;b=n/10%10;c=n%10;m=a*a*a+b*b*b+c*c*c;if(m==n)printf("%disthenumberwewant\n",n);elseprintf("%disnotthenumber\n",n);}*//*9'.输出所有水仙花数（调用函数(书P108为循环做法)）*/#includeintf(intn){inta,b,c,m;a=n/100;b=n/10%10;c=n%10;m=a*a*a+b*b*b+c*c*c;if(m==n)return1;elsereturn0;}voidmain(){inti,t;for(i=100;i<1000;i++){t=f(i);if(t==1)printf("%d\t",i);}}//10.百钱买百鸡（题目见书P115）//#includevoidmain(){inti,j,k;for(i=0;i<=20;i++){for(j=0;j<=33;j++){for(k=3;k<=99;k+=3){if((i+j+k==100)&&(5*i+3*j+k/3==100))printf("公鸡%d只，母鸡%d只，小鸡%d只\n",i,j,k);}}}}/*11.求最大公约数和最小公倍数，函数实现*/#includeintf(intm,intn){inti=1,t;if(mvoidmain(){inti,j,k=0,a;printf("10-2000之间的回文数有：\n");for(i=10;i<=2000;i++){a=i;j=0;while(a>0){j=j*10+a%10;a/=10;}if(i==j){printf("%d\t",i);k++;if(k%5==0)printf("\n");}}printf("\n");}*///12.2输出10-2000之间的回文数（函数调用）///*#includeintf(intn){inti=0;while(n>0){i=i*10+n%10;n/=10;}returni;}voidmain(){intn,k;printf("10-2000之间的回文数有：\n");for(n=10;n<=2000;n++){if(n==f(n)){printf("%d\t",n);k++;if(k%5==0)printf("\n");}}printf("\n");}*///12.3判断回文数（循环）///*#includevoidmain(){inti,a,j=0;printf("pleaseinputanumber:\n");scanf("%d",&i);a=i;while(a>0){j=j*10+a%10;a/=10;}if(j==i)printf("%d是回文数\n",i);elseprintf("%d不是回文数\n",i);}*///12.4判断回文数（函数调用）//#includeintf(intn){inti=0;while(n>0){i=i*10+n%10;n/=10;}returni;}voidmain(){intn;printf("pleaseinpitanumber:\n");scanf("%d",&n);if(n==f(n))printf("%d是回文数\n",n);elseprintf("%d不是回文数\n",n);}//13.排序////选择法///*#include#defineN10voidf(inta[],intn){inti,j,k,t;for(i=0;i<=n;i++){k=i;for(j=i+1;j#defineN5voidf(inta[],intn){inti,j;intt;for(i=0;ia[j+1]){t=a[j];a[j]=a[j+1];a[j+1]=t;}}}}*///插入法//#include#defineN5voidf(inta[],intn){inti,j;intt;for(i=0;i0&&a[j-1]>t){a[j]=a[j-1];--j;}a[j]=t;}}voidmain(){inta[N]={8,2,34,5,12};inti=0;intsize=sizeof(a)/sizeof(int);for(i=0;i#defineN3#defineM3voidmain(){inta[M][N],b[M][N];inti,j;printf("pleaseinputa[M][N]\n");for(i=0;iintf(intn){if(n==1||n==0)return1;elsereturnf(n-1)*n;}voidmain(){intn,m;printf("pleaseinputanumber:\n");scanf("%d",&n);m=f(n);printf("%d!=%d\n",n,m);}/*16.运用递归函数求斐波拉契数列（前30项）*/#includeintf(intn){if(n==1||n==2)return1;elsereturnf(n-1)+f(n-2);}voidmain(){inti,k=0;for(i=1;i<=30;i++){printf("%d\t",f(i));k++;if(k%5==0)printf("\n");}printf("\n");}//17.求a+aa+aaa+aaaa...///*#include#include#defineN5voidmain(){intn,i,j,k,a,sum1=0;printf("pleaseinputanumber:\n");scanf("%d",&n);for(i=1;i<=N;i++){k=fabs(10,i-1);j=n+n*(i-1)*k;sum1+=j;}printf("sum=%d\n",sum1);}*/#include#defineN5intk(inta,intsum){sum=sum*10+a;returnsum;}voidmain(){inta,i=0,j,sum=0;printf("pleaseinputanumber:\n");scanf("%d",&a);sum=k(a,k(a,sum));printf("sum=%d\n",sum);}//18.求符合条件的整数（如是某个二位数的平方，个位、十位、百位数各不相同等）//#includevoidmain(){inta,b,c,n,m;for(m=10;m<100;m++){n=m*m;a=n%10;b=n/10%10;c=n/100;if(a!=b&&b!=c&&c!=a)printf("%d\t",m);}printf("\n");}//19.字符串加密//#include#include#defineN80voidmain(){charstr[N];char*p;printf("pleaseinputthecode:\n");gets(str);p=str;while(*p!='\0'){*p+=2;p++;}printf("%s\n",str);}//20.统计字符串中字母和数字的个数//#include#include#include#defineN100voidmain(){charstr[N];inti=0;inta=0,b=0;printf("pleaseinputastring:\n");gets(str);while(str[i]!='\0'&&str[i]!='\n'){if(isdigit(str[i]))a++;elseif(isalpha(str[i]))b++;i++;}printf("thereare%dlettersand%dnumbers\n",b,a);}
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