常见C语言面试题之一：字符串代替、字符串转换整数

1.#include "stdafx.h"2.using namespace std;

3.//--------字符替代问题4.char* Translate(char* pSrc, const char cFindChar, const char* pReplaceStr, char* pTag)

5. {

6. char* p = NULL ;

7. int lLen = (int)strlen (pReplaceStr) ;

8.

9. for (p = pSrc; *p!='\0'; p++)

10. {

11. if (cFindChar == *p)

12. {

13. strcpy(pTag, pReplaceStr) ;

14. pTag += lLen ;

15. }

16. else

17. {

18. *pTag++ = *p;

19. }

20. }

21. return pTag;

22. }

23.24.//--------字符串转换为整数25.int myAtoi(const char* s){

26. int result = 0;

27. int flag = 1;

28. int i = 0;

29. while(isspace(s[i]))

30. i++;

31. if(s[i] == '-'){

32. flag = -1;

33. i++;

34. }

35. if(s[i] == '+')

36. i++;

37. while(s[i] != '\0'){

38. if((s[i] > '9') || (s[i] < '0'))

39. break;

40. int j = s[i] - '0';

41. result = 10 * result + j;

42. i++;

43. }

44. result = result * flag;

45. return result;

46.}

47.48.//--------整数转换为字符串49. void itoa (int n,char s[])

50. {

51. int i,j,sign;

52.53. if((sign=n)<0)//记录符号54. n=-n;//使n成为正数55. i=0;

56. do{

57. s[i++]=n%10+'0';//取下一个数字58. }while ((n/=10)>0);//删除该数字59.60. if(sign<0)

61. s[i++]='-';

62. s[i]='\0';

63.64. for(j=i;j>=0;j--)//生成的数字是逆序的，所以要逆序输出65. printf("%c",s[j]);

66. printf("\n");

67.68. }

69.int _tmain(int argc, _TCHAR* argv[])

70.{

71. //--------Translate----------72. char szSrc[] = "Hello Word!" ;

73. char szTag[256]= {0};

74. char szRep[] ="(***)";

75. char result[256] = {0};

76. Translate(szSrc,'o',szRep,szTag);

77. for(unsigned int i=0;i<strlen(szTag);i++) result[i] = szTag[i];

78. printf("%s\n",szTag);

79. printf("%s\n",result);

80. //-----------------------81. int i = atoi(" -321" );

82. printf("%d\n",i);

83. char ch[256]={0};

84. itoa(-23456, ch);

85.

86. return 0;

87.}

88.

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