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  1. #include <stdio.h>
  2. #include <string.h>
  3. #include <stdlib.h>
  4.  
  5. void xoadau(char a[])
  6. {
  7. 	if(a[0]==' ')
  8. 	{
  9. 		for (int i=0;i<strlen(a);i++)
  10. 		{
  11. 			if(a[i]!=' ')
  12. 			{
  13. 				strcpy(a,&a[i]);
  14. 					break;
  15. 			}
  16. 		}
  17. 	}
  18. }
  19.  
  20. void xoacuoi(char a[])
  21. {
  22. 	if(a[strlen(a)-1]==' ')
  23. 	{
  24. 		for(int i=strlen(a)-1;i>0;i--)
  25. 		{
  26. 			if(a[i]!=' ')
  27. 			{
  28. 				a[i+1]='\0';
  29. 					break;
  30. 			}
  31. 		}
  32. 	}
  33. }
  34.  
  35. void xoagiua(char a[])
  36. {
  37. 	for(int i=0; i<strlen(a);i++)
  38. 	{
  39. 		if(a[i]==' ' && a[i+1]==' ')
  40. 		{
  41. 			for(int j=i+1; j<strlen(a);j++)
  42. 			{
  43. 				if(a[j]!=' ')
  44. 				{
  45. 					strcpy(&a[i+1], &a[j]);
  46. 						break;
  47. 				}
  48. 			}
  49. 		}
  50. 	}
  51. }
  52.  
  53. main()
  54. {
  55. 	char a[100];
  56. 	printf("nhap vao mang a: ");
  57. 	gets(a);
  58. 	puts(a);
  59. 	printf("\n\tso luong phan tu la %d", strlen(a));
  60. xoadau(a);
  61. 	puts(a);
  62. 	printf("\n\tso luong phan tu la %d", strlen(a));
  63. xoacuoi(a);
  64. 	puts(a);
  65. 	printf("\n\tso luong phan tu la %d", strlen(a));
  66. xoagiua(a);
  67. 	puts(a);
  68. 	printf("\n\tso luong phan tu la %d", strlen(a));
  69.  
  70. }
Success #stdin #stdout 0s 2116KB
comments (?)
stdin
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Standard input is empty
stdout
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nhap vao mang a: 

	so luong phan tu la 0

	so luong phan tu la 0

	so luong phan tu la 0

	so luong phan tu la 0
https://ideone.com/ivwfLR
language:
C (gcc 8.3)
created:
9 years ago
visibility:
public

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