2018.3.17

2018.3.17

1. 一个数组中只有两个数字是出现一次&＃xff0c;其他所有数字都出现了两次。 找出这两个数字&＃xff0c;编程实现。


#include
int main()
{int result[10] &＃61; {0};int a[18] &＃61; {0};int n;int i;int max &＃61; 0;printf("Please input a number for counting: ");scanf("%d", &n);printf("Please input some numbers: ");for(i &＃61; 0; i"%d", &a[i]);if(a[i]>max) max &＃61; a[i];}while(n--){for(i &＃61;0; i<&＃61;max; i&＃43;&＃43;){if(a[n] &＃61;&＃61; i){result[i]&＃43;&＃43;;break;}}}for(i &＃61; 0; i<&＃61;max; i&＃43;&＃43;){ if(result[i] &＃61;&＃61; 1){printf("%d ", i);}}return 0;
}

2. 喝汽水&＃xff0c;1瓶汽水1元&＃xff0c;2个空瓶可以换一瓶汽水&＃xff0c;给20元&＃xff0c;可以喝多少汽水。编程实现。

#include
int main()
{int money &＃61; 0;int count &＃61; 0;scanf("%d", &money);count &＃43;&＃61; money;while(money /&＃61; 2){count &＃43;&＃61; money; }printf("%d\n", count);return 0;
}

3. 模拟实现strcpy

#include
#include
#include
char *my_strcpy(char *des, const char *source)
{char *p &＃61; des;const char *q &＃61; source;assert(des);assert(source);while(*p&＃43;&＃43; &＃61; *q&＃43;&＃43;){;}return p;
}int main(){char a[10] &＃61; "abcdefg";char b[10];memset(b, 0, 10);my_strcpy(b, a);printf("%s\n", b);return 0;
}

4. 模拟实现strcat

#include
#include
char *my_strcat(char *des, const char *source)
{char *de &＃61; des;const char *sou &＃61; source;assert(des);assert(source);while(*de) de&＃43;&＃43;;while(*de&＃43;&＃43; &＃61; *sou&＃43;&＃43;){;}
}int main()
{ char a[15] &＃61; "Oh, my ";char *b &＃61; "god!";my_strcat(a, b);printf("%s\n", a);return 0;
}