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判断是否为润年的软件:输入三个数为之从小到大排序:#include<stdio.h>voidmain(){inta,b,c,t;scanf("%d%d%d",&a,&b,&c);if(a>b){t=a;a=b;b=t;};if(b>c){t=b;b=c;c=t;};if(a>c){t=a;a=c;c=t;};printf("%d<%d<%d",a,b,c);}分段函数软件:#include<stdio.h>voidmain(){doublex,y;scanf("%lf",&x);if(x>0)y=x+2;elseif(x==0)y=x;elsey=x-2;printf("%lf",y);}条件如输入一个数学成绩判断等级软件:#include<stdio.h>voidmain(){doublegrade;scanf("%lf",&grade);if(grade>100||grade<0)printf("illegal");elseif(grade>=90)printf("A");elseif(grade>=80)printf("B");elseif(grade>=70)printf("C");elseif(grade>=60)printf("D");elseprintf("E");}从1加到100软件:#include<stdio.h>voidmain(){intsum,i;sum=0;i=0;while(i<=100){sum+=i;i++;}printf("sum=%d",sum);}判断一个数是否为素数#include<stdio.h>voidmain(){inti,n;printf("pleaseinputamunber\n");scanf("%d",&n);for(i=2;i<n-1;i++)if(n%i==0){printf("thenumberisnotaprime\n");break;}if(i==n)printf("thenumberisaprime\n");}或者:#include<stdio.h>#include<math.h>voidmain(){inti,n,flag=1;printf("pleaseinputamunber\n");scanf("%d",&n);for(i=2;i<=sqrt(n);i++)if(n%i==0){flag=0;break;}if(flag==0)printf("thenumberisnotaprime\n");elseprintf("thenumberisaprime\n");}请输入一个整数:不是素数#include<stdio.h>#include<math.h>voidmain(){inti,n,flag=1;printf("请输入一个整数:\n");scanf("%d",&n);for(i=2;i<=sqrt(n);i++)if(n%i==0){flag=0;break;}if(flag==0)printf("不是素数\n");elseprintf("是素数\n");}#include<stdio.h>#include<math.h>voidmain(){inti,n,flag=1;printf("请输入一个整数:\n");scanf("%d",&n);for(i=2;i<=sqrt(n);i++)if(n%i==0){flag=0;break;}if(flag==0)printf("不是素数,他的一个因数是");elseprintf("是素数\n");if(flag==0)printf("%d\n",i);}输入输出软件(全局变量);#include<stdio.h>inta[10];voidarrin(){inti;for(i=0;i<10;i++)scanf("%d",&a[i]);}voidarrout(){inti;for(i=0;i<10;i++)printf("%3d",a[i]);printf("\n");}voidmain(){arrin();arrout();}(局部变量):#include<stdio.h>voidarrin(int*p){inti;for(i=0;i<10;i++)scanf("%d",&p[i]);}voidarr