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  1. #include <stdlib.h>
  2. #include <stdio.h>
  3. #include <string.h>
  4.  
  5. #define MAX 100
  6. void thuongSangHoa(char a[MAX]){
  7.     int n = strlen(a);
  8.     for (int i = 0; i < n; i++)
  9.     {
  10.         if (a[i] >= 97 && a[i] <= 122)
  11.         {
  12.             a[i] -= 32;
  13.         }
  14.  
  15.     }
  16.  
  17. }
  18.  
  19. void hoaSangThuong(char a[MAX]){
  20.     int n = strlen(a);
  21.     for (int i = 0; i < n; i++)
  22.     {
  23.         if (a[i] >= 65 && a[i] <= 90)
  24.         {
  25.             a[i] += 32;
  26.         }
  27.  
  28.     }
  29.  
  30. }
  31.  
  32. void kyTuDauInHoa(char a[MAX]){
  33.     int n = strlen(a);
  34.     hoaSangThuong(a);
  35.  
  36.     for (int i = 0; i < n; i++)
  37.     {
  38.         if (a[i] == ' ')
  39.         {
  40.             a[i + 1] -= 32;
  41.         }
  42.     }
  43.  
  44.     a[0] -= 32;
  45.  
  46. }
  47.  
  48. int main(){
  49.     system("cls");
  50.     char a[MAX];
  51.     printf("Nhap vao chuoi: ");
  52.     gets(a);
  53.  
  54.     thuongSangHoa(a);
  55.     printf("Chuoi sua khi chuyen sang chu in hoa: ");
  56.     for (int i = 0; i < strlen(a); i++)
  57.     {
  58.         printf("%c", a[i]);
  59.     }
  60.  
  61.     hoaSangThuong(a);
  62.     printf("\nChuoi sua khi chuyen sang chu thuong: ");
  63.     for (int i = 0; i < strlen(a); i++)
  64.     {
  65.         printf("%c", a[i]);
  66.     }
  67.  
  68.     kyTuDauInHoa(a);
  69.     printf("\nChuoi sua khi chuyen sang chu ky tu dau la in hoa: ");
  70.     for (int i = 0; i < strlen(a); i++)
  71.     {
  72.         printf("%c", a[i]);
  73.     }
  74.  
  75.     return 0;
  76. }
Success #stdin #stdout #stderr 0.01s 5296KB
comments (?)
stdin
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Standard input is empty
stdout
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Nhap vao chuoi: Chuoi sua khi chuyen sang chu in hoa: 
Chuoi sua khi chuyen sang chu thuong: 
Chuoi sua khi chuyen sang chu ky tu dau la in hoa: �
stderr
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sh: 1: cls: not found
https://ideone.com/qaN2e5
hoa sang thuong, thuong sang hoa, ky tu dau la hoa
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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