C語言:根據形參c中指定的英文字母,按順序打印出若幹後繼相鄰字母,
阿新 • • 發佈:2019-03-15
*** def fopen pan fprintf rb+ += 鏈表結構 文件
//根據形參c中指定的英文字母,按順序打印出若幹後繼相鄰字母,輸出字母的大小與形參c一致,數量由形參d指定。例如:輸入c為Y,d為4,則輸出ZABC。
1 #include <stdio.h> 2 #pragma warning (disable:4996) 3 void fun(char c, int d) { 4 int i; 5 char A[26], a[26], *ptr; 6 /**********found**********/ 7 for (i=0; i<26; i++) { 8 A[i] = ‘A‘ + i;9 a[i] = ‘a‘ + i; 10 } 11 /**********found**********/ 12 if ((c >= ‘a‘) && (c<= ‘z‘)) ptr = a; 13 else ptr = A; 14 /**********found**********/ 15 for (i=1; i<=d; i++) printf("%c", ptr[(c-ptr[0]+i) % 26] ); 16 } 17 main( ) { 18 char c; int d; 19 printf("please input c & d:\n"); 20 scanf("%c%d", &c, &d); 21 fun(c, d); 22 }
//N名學生的成績已在主函數中放入一個帶頭節點的鏈表結構中,h指向鏈表的頭節點。fun函數找出學生的最高分,返回。
1 #include <stdio.h> 2 #include <stdlib.h> 3 #define N 8 4 struct slist 5 { double s; 6 struct slist *next; 7 }; 8 typedef struct slist STREC;9 double fun( STREC *h ) 10 { 11 STREC *p, *q; 12 double max; 13 p = h; 14 q = h->next; 15 max = q->s; 16 while (q != NULL) 17 { 18 p = q; 19 q = q->next; 20 if (p->s > max) max = p->s; 21 } 22 return max; 23 } 24 25 STREC * creat( double *s) 26 { STREC *h,*p,*q; int i=0; 27 h=p=(STREC*)malloc(sizeof(STREC));p->s=0; 28 while(i<N) 29 { q=(STREC*)malloc(sizeof(STREC)); 30 q->s=s[i]; i++; p->next=q; p=q; 31 } 32 p->next=0; 33 return h; 34 } 35 void outlist( STREC *h) 36 { STREC *p; 37 p=h->next; printf("head"); 38 do 39 { printf("->%2.0f",p->s);p=p->next;} 40 while(p!=0); 41 printf("\n\n"); 42 } 43 void main() 44 { double s[N]={85,76,69,85,91,72,64,87}, max;void NONO (); 45 STREC *h; 46 h=creat( s ); outlist(h); 47 max=fun( h ); 48 printf("max=%6.1f\n",max); 49 NONO(); 50 } 51 void NONO () 52 {/* 本函數用於打開文件,輸入數據,調用函數,輸出數據,關閉文件。 */ 53 FILE *in, *out ; 54 int i,j ; double s[N],max; 55 STREC *h ; 56 in = fopen("in.dat","r") ; 57 out = fopen("out.dat","w") ; 58 for(i = 0 ; i < 10 ; i++) { 59 for(j=0 ; j < N; j++) fscanf(in, "%lf,", &s[j]) ; 60 h=creat( s ); 61 max=fun( h ); 62 fprintf(out, "%6.1lf\n", max) ; 63 } 64 fclose(in) ; 65 fclose(out) ; 66 }
//另一種方式:
1 double fun(STREC *h) 2 { 3 double max=h->s; 4 while(h!=NULL) 5 { 6 if(max<h->s)max=h->s; 7 h=h->next; 8 } 9 return max; 10 }
//使用插入排序法對字符串中的字符進行升序排序。插入法基本算法:先對頭兩個字符進行排序,然後把第三個字符插入到前兩個字符中,插入後前三個字符依然有序,再插入第四個字符到前三個中。
1 #include <stdio.h> 2 #include <string.h> 3 #define N 80 4 void insert(char *aa) 5 { int i,j,n; char ch; 6 /**********found**********/ 7 n=strlen(aa); 8 for( i=1; i<n ;i++ ) { 9 /**********found**********/ 10 ch=aa[i]; 11 j=i-1; 12 while ((j>=0) && ( ch<aa[j] )) 13 { aa[j+1]=aa[j]; 14 j--; 15 } 16 aa[j+1]=ch; 17 } 18 } 19 void main( ) 20 { char a[N]="QWERTYUIOPASDFGHJKLMNBVCXZ"; 21 printf ("The original string : %s\n", a); 22 insert(a) ; 23 printf("The string after sorting : %s\n\n",a ); 24 }
//從文件中找到指定學號的學生數據,讀入次學生數據,對該學生的分數進行修改,使每門課的分數加3分,修改後重寫文件中學生的數據。
1 #include <stdio.h> 2 #define N 5 3 typedef struct student { 4 long sno; 5 char name[10]; 6 float score[3]; 7 } STU; 8 void fun(char *filename, long sno) 9 { FILE *fp; 10 STU n; int i; 11 fp = fopen(filename,"rb+"); 12 /**********found**********/ 13 while (!feof(fp))//文件結束檢測函數feof 14 { fread(&n, sizeof(STU), 1, fp); 15 /**********found**********/ 16 if (n.sno==sno) break; 17 } 18 if (!feof(fp)) 19 { for (i=0; i<3; i++) n.score[i] += 3; 20 /**********found**********/ 21 fseek(fp, -(long)sizeof(STU), SEEK_CUR);//文件定位函數fseek,用來移動文件內部位置指針。第二個參數表示位移量 22 fwrite(&n, sizeof(STU), 1, fp); 23 } 24 fclose(fp); 25 } 26 void main() 27 { STU t[N]={ {10001,"MaChao", 91, 92, 77}, {10002,"CaoKai", 75, 60, 88}, 28 {10003,"LiSi", 85, 70, 78}, {10004,"FangFang", 90, 82, 87}, 29 {10005,"ZhangSan", 95, 80, 88}}, ss[N]; 30 int i,j; FILE *fp; 31 fp = fopen("student.dat", "wb"); 32 fwrite(t, sizeof(STU), N, fp); 33 fclose(fp); 34 printf("\nThe original data :\n"); 35 fp = fopen("student.dat", "rb"); 36 fread(ss, sizeof(STU), N, fp); 37 fclose(fp); 38 for (j=0; j<N; j++) 39 { printf("\nNo: %ld Name: %-8s Scores: ",ss[j].sno, ss[j].name); 40 for (i=0; i<3; i++) printf("%6.2f ", ss[j].score[i]); 41 printf("\n"); 42 } 43 fun("student.dat", 10003); 44 fp = fopen("student.dat", "rb"); 45 fread(ss, sizeof(STU), N, fp); 46 fclose(fp); 47 printf("\nThe data after modifing :\n"); 48 for (j=0; j<N; j++) 49 { printf("\nNo: %ld Name: %-8s Scores: ",ss[j].sno, ss[j].name); 50 for (i=0; i<3; i++) printf("%6.2f ", ss[j].score[i]); 51 printf("\n"); 52 } 53 }
C語言:根據形參c中指定的英文字母,按順序打印出若幹後繼相鄰字母,