C语言百例

　　经典c程序100例==91--100 【程序91】 题目：时间函数举例1 1.程序分析： 2.程序源代码： #include "stdio.h" #include "conio.h" #include "time.h" void main() { time_t lt; /*define a longint time varible*/ lt=time(NULL);/*system time and date*/ printf(ctime(&lt)); /*english format output*/ printf(asctime(localtime(&lt)));/*tranfer to tm*/ printf(asctime(gmtime(&lt))); /*tranfer to Greenwich time*/ getch(); } ============================================================== 【程序92】 题目：时间函数举例2 1.程序分析：　　　　　　　　　　　 2.程序源代码： /*calculate time*/ #include "time.h" #include "stdio.h" #include "conio.h" main() { time_t start,end; int i; start=time(NULL); for(i=0;i<30000;i++) printf("\1\1\1\1\1\1\1\1\1\1\n"); end=time(NULL); printf("\1: The different is %6.3f\n",difftime(end,start)); getch(); } ============================================================== 【程序93】 题目：时间函数举例3 1.程序分析： 2.程序源代码： /*calculate time*/ #include "time.h" #include "stdio.h" #include "conio.h" main() { clock_t start,end; int i; double var; start=clock(); for(i=0;i<10000;i++) printf("\1\1\1\1\1\1\1\1\1\1\n"); end=clock(); printf("\1: The different is %6.3f\n",(double)(end-start)); getch(); } ============================================================== 【程序94】 题目：时间函数举例4,一个猜数游戏，判断一个人反应快慢。（版主初学时编的） 1.程序分析： 2.程序源代码： #include "time.h" #include "stdlib.h" #include "stdio.h" #include "conio.h" main() { char c; clock_t start,end; time_t a,b; double var; int i,guess; srand(time(NULL)); printf("do you want to play it.('y' or 'n') \n"); loop: while((c=getchar())=='y') { i=rand()%100; printf("\nplease input number you guess:\n"); start=clock(); a=time(NULL); scanf("%d",&guess); while(guess!=i) { if(guess>i) { printf("please input a little smaller.\n"); scanf("%d",&guess); } else { printf("please input a little bigger.\n"); scanf("%d",&guess); } } end=clock(); b=time(NULL); printf("\1: It took you %6.3f seconds\n",var=(double)(end-start)/18.2); printf("\1: it took you %6.3f seconds\n\n",difftime(b,a)); if(var<15) printf("\1\1 You are very clever! \1\1\n\n"); else if(var<25) printf("\1\1 you are normal! \1\1\n\n"); else printf("\1\1 you are stupid! \1\1\n\n"); printf("\1\1 Congradulations \1\1\n\n"); printf("The number you guess is %d",i); } printf("\ndo you want to try it again?(\"yy\".or.\"n\")\n"); if((c=getch())=='y') goto loop; } ============================================================== 【程序95】 题目：家庭财务管理小程序 1.程序分析： 2.程序源代码： /*money management system*/ #include "stdio.h" #include "dos.h" #include "conio.h" main() { FILE *fp; struct date d; float sum,chm=0.0; int len,i,j=0; int c; char ch[4]="",ch1[16]="",chtime[12]="",chshop[16],chmoney[8]; pp: clrscr(); sum=0.0; gotoxy(1,1);printf("|---------------------------------------------------------------------------|"); gotoxy(1,2);printf("| money management system(C1.0) 2000.03 |"); gotoxy(1,3);printf("|---------------------------------------------------------------------------|"); gotoxy(1,4);printf("| -- money records -- | -- today cost list -- |"); gotoxy(1,5);printf("| ------------------------ |-------------------------------------|"); gotoxy(1,6);printf("| date: -------------- | |"); gotoxy(1,7);printf("| | | | |"); gotoxy(1,8);printf("| -------------- | |"); gotoxy(1,9);printf("| thgs: ------------------ | |"); gotoxy(1,10);printf("| | | | |"); gotoxy(1,11);printf("| ------------------ | |"); gotoxy(1,12);printf("| cost: ---------- | |"); gotoxy(1,13);printf("| | | | |"); gotoxy(1,14);printf("| ---------- | |"); gotoxy(1,15);printf("| | |"); gotoxy(1,16);printf("| | |"); gotoxy(1,17);printf("| | |"); gotoxy(1,18);printf("| | |"); gotoxy(1,19);printf("| | |"); gotoxy(1,20);printf("| | |"); gotoxy(1,21);printf("| | |"); gotoxy(1,22);printf("| | |"); gotoxy(1,23);printf("|---------------------------------------------------------------------------|"); i=0; getdate(&d); sprintf(chtime,"%4d.%02d.%02d",d.da_year,d.da_mon,d.da_day); for(;;) { gotoxy(3,24);printf(" Tab __browse cost list Esc __quit"); gotoxy(13,10);printf(" "); gotoxy(13,13);printf(" "); gotoxy(13,7);printf("%s",chtime); j=18; ch[0]=getch(); if(ch[0]==27) break; strcpy(chshop,""); strcpy(chmoney,""); if(ch[0]==9) { mm: i=0; fp=fopen("home.dat","r+"); gotoxy(3,24);printf(" "); gotoxy(6,4);printf(" list records "); gotoxy(1,5);printf("|-------------------------------------|"); gotoxy(41,4);printf(" "); gotoxy(41,5);printf(" |"); while(fscanf(fp,"%10s%14s%f\n",chtime,chshop,&chm)!=EOF) { if(i==36) { getch(); i=0; } if((i%36)<17) { gotoxy(4,6+i); printf(" "); gotoxy(4,6+i); } else if((i%36)>16) { gotoxy(41,4+i-17); printf(" "); gotoxy(42,4+i-17); } i++; sum=sum+chm; printf("%10s %-14s %6.1f\n",chtime,chshop,chm); } gotoxy(1,23);printf("|---------------------------------------------------------------------------|"); gotoxy(1,24);printf("| |"); gotoxy(1,25);printf("|---------------------------------------------------------------------------|"); gotoxy(10,24);printf("total is %8.1f$",sum); fclose(fp); gotoxy(49,24);printf("press any key to.....");getch();goto pp; } else { while(ch[0]!='\r') { if(j<10) { strncat(chtime,ch,1); j++; } if(ch[0]==8) { len=strlen(chtime)-1; if(j>15) {len=len+1; j=11;} strcpy(ch1,""); j=j-2; strncat(ch1,chtime,len); strcpy(chtime,""); strncat(chtime,ch1,len-1); gotoxy(13,7);printf(" "); } gotoxy(13,7);printf("%s",chtime);ch[0]=getch(); if(ch[0]==9) goto mm; if(ch[0]==27) exit(1); } gotoxy(3,24);printf(" "); gotoxy(13,10); j=0; ch[0]=getch(); while(ch[0]!='\r') { if (j<14) { strncat(chshop,ch,1); j++; } if(ch[0]==8) { len=strlen(chshop)-1; strcpy(ch1,""); j=j-2; strncat(ch1,chshop,len); strcpy(chshop,""); strncat(chshop,ch1,len-1); gotoxy(13,10);printf(" "); } gotoxy(13,10);printf("%s",chshop);ch[0]=getch(); } gotoxy(13,13); j=0; ch[0]=getch(); while(ch[0]!='\r') { if (j<6) { strncat(chmoney,ch,1); j++; } if(ch[0]==8) { len=strlen(chmoney)-1; strcpy(ch1,""); j=j-2; strncat(ch1,chmoney,len); strcpy(chmoney,""); strncat(chmoney,ch1,len-1); gotoxy(13,13);printf(" "); } gotoxy(13,13);printf("%s",chmoney);ch[0]=getch(); } if((strlen(chshop)==0)||(strlen(chmoney)==0)) continue; if((fp=fopen("home.dat","a+"))!=NULL); fprintf(fp,"%10s%14s%6s",chtime,chshop,chmoney); fputc('\n',fp); fclose(fp); i++; gotoxy(41,5+i); printf("%10s %-14s %-6s",chtime,chshop,chmoney); } }