有关c语言常考题的编程

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1、1：求输入分数，输出等级.如：输入97，输出A？#includeintmain(){intt,s;scanf("%d",&s);if(s<60)t=5;elset=s/10;switch(t){case10:case9:printf("A");break;case8:printf("B");break;case7:printf("C");break;case6:printf("D");break;case5:printf("E");break;default:printf("enterdatderror!")

2、;}return0;}2：求2+3/2+5/3+8/5+13/8+….?(20个相加)#includeintmain(){intj=1;floats=2.0,sum=0.0,i=2.0,t=1.0,n;while(j<=20){j++;sum=sum+s;n=i;i=n+t;t=n;s=i/t;}printf("%f",sum);return0;}3：求a+aa+aaa+…+(n个a)的值？#includeintmain(){intt,a,n,sum=0;scanf("%d%d",&a,&n);t=a;whil

3、e(n!=0){sum=sum+t;t=t*10+a;--n;}printf("sumis%ld",sum);return0;}4：求一元二次方程的根？#include#includeintmain(){doublea,b,c,disc,x1,x2,p,q;scanf("a=%lfb=%lfc=%lf",&a,&b,&c);disc=b*b-4*a*c;p=-b/(2.0*a);q=sqrt(disc)/(2.0*a);x1=p+q;x2=p-q;printf("x1=%7.2fx2=%7.2f",x1,

4、x2);return0;}5：找100到200之间的素数？#include#includeintmain(){inti,j,k,m=0;for(i=100;i<=200;i++){k=sqrt(i);for(j=2;j<=k;j++){if(i%j==0)break;}if(j>=k+1){m++;printf("%5d",i);}if(m%10==0)printf("");}return0;}6：求100到999的水仙花（例如（153=1的3次方+5的3次方+1的3次方即（151=13+53+13）？#incl

5、ude#includeintmain(){intn,a,b,c;for(n=100;n<=999;n++){a=n/100;b=n%100/10;c=n%10;if(n=a*a*a+b*b*b+c*c*c)printf("%d=%d3+%d3+%d3",n,a,b,c);}printf("");return0;}7：求输入任意十个整数，输出由小到大的十个整数？#includeintmain(){inta[10];inti,j,t;printf("pleaseenter10numbles:

6、");for(i=0;i<=9;i++)scanf("%d",&a[i]);for(j=0;j<9;j++){for(i=0;i<=9-j;i++)if(a[i]>a[i+1]){t=a[i];a[i]=a[i+1];a[i+1]=t;}}printf("pleasethesortednumbers:");for(i=0;i<=9;i++)printf("%4d",a[i]);printf("");return0;}8：将一个二维的行列互换，存到另一个二维数组中？#includeintmain(){inta[2][3]={{

7、1,2,3},{4,5,6}};intb[3][2],i,j;printf("arraya:");for(i=0;i<=1;i++){for(j=0;j<=2;j++){printf("%5d",a[i][j]);b[j][i]=a[i][j];}printf("");}printf("arrayb:");for(i=0;i<=2;i++){for(j=0;j<=1;j++){printf("%5d",b[i][j]);}printf("");}return0;}9：求一个矩阵的最大值元素，以及其所在的行号与列号？#include

8、tdio.h>intmain(){inti,j,row=0,colum=0,max;inta[3][4]={