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  1.  
  2. #include<stdio.h>
  3.  
  4. char s[101];
  5. char str[205];
  6.  
  7. int main()
  8. {
  9.     int i,flag,error_flag,j;
  10.    // FILE *file;
  11.     //file = fopen("F:\\file.txt","w");
  12.  
  13.  
  14.     while(scanf("%s",s)!=EOF){
  15.         i = 0 ;
  16.         j = 0 ;
  17.         error_flag = 0;
  18.         while( s[i] != '_' && ( s[i] < 'A' || s[i] > 'Z') && s[i]!='\0'){
  19.                 str[j] = s[i] ;
  20.                 i++;
  21.                 j++;
  22.         }
  23.         if(s[i]=='\0'){
  24.             printf("%s\n",s);
  25.             continue;
  26.         }
  27.  
  28.         if(s[i]>='A' && s[i] <= 'Z' && i==0){
  29.             printf("Error!\n");
  30.             continue;
  31.         }
  32.  
  33.         if(s[i]=='_')
  34.             flag  = 0;
  35.         else
  36.             flag = 1;
  37.  
  38.  
  39.         while(s[i] != '\0'){
  40.             if( s[i] == '_'){
  41.                  if( flag == 1 ){
  42.                     error_flag = 1;
  43.  
  44.                 }
  45.                 else{
  46.                     str[j] = s[i+1] - 32;
  47.                     j++;
  48.                     i += 2;
  49.                 }
  50.             }
  51.             else if (s[i] >= 'A' && s[i] <= 'Z'){
  52.                 if( flag == 0 ){
  53.                     error_flag = 1;
  54.                 }
  55.                 else{
  56.                     str[j] = '_';
  57.                     str[j+1] = s[i] + 32;
  58.                     j += 2;
  59.                     i++;
  60.                 }
  61.  
  62.             }
  63.             else{
  64.                 str[j] = s[i];
  65.                 j++;
  66.                 i++;
  67.             }
  68.             if (error_flag)
  69.                 break;
  70.  
  71.         }
  72.  
  73.         str[j] = '\0';
  74.         j = 0;
  75.  
  76.         while(str[j] != '\0'){
  77.  
  78.             if(str[j]=='_' || (str[j]>='A' && str[j] <= 'Z') || (str[j]>='a' && str[j] <= 'z')){
  79.  
  80.             }
  81.             else{
  82.                 error_flag=1;
  83.                 break;
  84.             }
  85.             j++;
  86.         }
  87.  
  88.         if(error_flag == 0){
  89.             printf("%s\n",str);
  90.             //fprintf(file,"%s",str);
  91.         }
  92.         else
  93.             printf("Error!\n");
  94.  
  95.  
  96.     }
  97.     //fclose(file);
  98.     return 0;
  99. }
  100.  
Success #stdin #stdout 0s 2012KB
comments (?)
stdin
copy 
long_and_mnemonic_identifier
anotherExample
i
bad_Style
aA
AAa
nEERC
stdout
copy 
longAndMnemonicIdentifier
another_example
i
Error!
a_a
Error!
n_e_e_r_c
https://ideone.com/UUc0fN
language:
C (gcc 8.3)
created:
10 years ago
visibility:
secret

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