c语言知识点.docx

陈志刚物联网专业第一题:#include<>voidmain(){ intx,i,a[11]={2,4,6,8,10,12,14,16,18,20}; printf("请输入要插入的数值x:\n"); scanf("%d",&x); for(i=9;i>=0;i--) { if(x<=a[i]) { a[i+1]=a[i]; if(i==0) a[i]=x; } else { a[i+1]=x; break; } } for(i=0;i<11;i++) printf("%3d",a[i]); printf("\n");}第二题:升序:#include<>#defineN7voidmain(){inti,j,k,t;inta[N]={13,7,24,9,2,17,22};printf("排序前:");for(i=0;i<N;i++) printf("%5d\t",a[i]); printf("\n"); for(i=0;i<N-1;i++) { k=i; for(j=i+1;j<N;j++) if(a[j]<a[k]) k=j; if(i!=k) { t=a[i]; a[i]=a[k]; a[k]=t; } }printf("排序后:");for(i=0;i<N;i++) printf("%5d\t",a[i]); printf("\n");}降序:#include<>#defineN7voidmain(){inti,j,k,t;inta[N]={13,7,24,9,2,17,22};printf("排序前:");for(i=0;i<N;i++) printf("%5d\t",a[i]); printf("\n"); for(i=0;i<N-1;i++) { k=i; for(j=i+1;j<N;j++) if(a[j]>a[k]) k=j; if(i!=k) { t=a[i]; a[i]=a[k]; a[k]=t; } }printf("排序后:");for(i=0;i<N;i++) printf("%5d\t",a[i]); printf("\n");}第三题:升序:#include<>#defineN7voidmain(){inti,j,t;inta[N]={13,7,24,9,2,17,22};printf("排序前:");for(i=0;i<N;i++) printf("%5d\t",a[i]); printf("\n"); for(i=0;i