C classic 100 examples - 91-95

Topic 91

Topic: Time Function Example 1

#include<cstdio>
#include<ctime> 

//  涉及到时间函数的部分，这里给出资料。
// (主要我并没有深入了解这些东西 

int main()
{
    time_t lt;// 定义一个时间变量 
    lt = time(NULL);// 系统时间与日期
    printf(ctime(<));// 英文的时间格式
    printf(asctime(localtime(<)));// 
    printf(asctime(gmtime(<))); 
}
// asctime() : https://www.runoob.com/cprogramming/c-function-asctime.html
// ctime(): https://www.runoob.com/cprogramming/c-function-ctime.html
// localtime(): https://www.runoob.com/cprogramming/c-function-localtime.html 
// gmtime(): https://www.runoob.com/cprogramming/c-function-gmtime.html 

           

Topic 92

Topic: Time Function Example 2

#include<cstdio>
#include<ctime>
#define R register

// 计算程序运行时间,之前提到过的 

int main()
{
    // 这里与之前的不同，这里是通过本地时间计算的运行时间 
    time_t start_time,end_time;
    start_time = time(NULL);
    for(R int i = 1;i <= 3000;i++)
        printf("\1\1\1\1\1\1\1\1\1\1\n");
    // \1 为转义字符 
    end_time = time(NULL); 
    printf("\1: The different is %6.3f\n",difftime(end_time,start_time));
    // difftime返回的是 结束时间与开始时间相差的秒数
    // 注意参数顺序是结束时间,开始时间 
}
           

Topic 93

Topic: Time Function Example 3

#include<cstdio>
#include<ctime>
#define R register

// 同样是计算程序运行时间 
// clock() : https://www.runoob.com/cprogramming/c-function-clock.html 

int main()
{
    clock_t start_time,end_time;
    start_time = clock();
    for(R int i = 1;i <= 10000;i++)
        printf("\1\1\1\1\1\1\1\1\1\1\n");
    end_time = clock();
        printf("\1: The different is %6.3lf\n",(double)(end_time - start_time) / CLOCKS_PER_SEC);
}
           

Topic 94

Topic: Time function Example 4 (a guessing game to determine how quickly a person reacts).

#include<cstdio>
#include<ctime>
#include<cstdlib>
#define R register

int x;

int main()
{
    clock_t start_time,end_time;
    srand(time(NULL));
    printf("now you need to guess this number\n");
    int ans = rand()%100,cnt = 1;
    start_time = clock();
    scanf("%d",&x);
    while(x != ans)
    {
        if(x > ans)
            printf("more smaller please\n");
        if(x < ans)
            printf("more bigger please\n");
        scanf("%d",&x);
        cnt++;
    }
    end_time = clock();
    printf("You only guessed %d times!\n",cnt);
    printf("And you used %6.3lf s",(double)(end_time - start_time) / CLOCKS_PER_SEC);

}
           

Topic 95

Topic: Family Financial Management Mini Program

/*money management system*/ 
#include <cstdio> 
#include <dos.h>


// 这里的代码是网上流传的未解决的代码
// 代码太抽象了，这里调整了一下排版，由于不清楚具体操作是做什么，又懒得分析，这个代码并没有完善，还是网络上的那个带有bug的代码
// 如果有人想修复这个代码的话，可以喊上我一起(- -自己抽不出大把的时间进行完善分析 
int 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); 52 
    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#34;,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; 
            // 这下面的if不知道应该配上哪一个，未作改动 
            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); 
        }
    }
}