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  1. #include <stdio.h>    
  2. #include <ctype.h>
  3. #include <string.h>
  4. char* conv_string(char*data,int type){
  5.     int str_len=strlen(data);
  6.     char *conv_data=data;
  7.     switch(type){
  8.         case 1:{
  9.             for(int i =0;i<str_len;i++){
  10.                 if(data[i]>='a' && data[i]<='z'){
  11.                     conv_data[i]=data[i]-'a'+'A';  //-32
  12.                 }else{
  13.                     conv_data[i]=data[i];
  14.                 }
  15.             }
  16.             break;
  17.         }
  18.         case 2:{
  19.             for(int i =0;i<str_len;i++){
  20.                 if(data[i]>='A' && data[i]<='Z'){
  21.                     conv_data[i]=data[i]+'a'-'A'; //+32
  22.                 }else{
  23.                     conv_data[i]=data[i];
  24.                 }
  25.  
  26.             }
  27.             break;
  28.         }
  29.         default:{
  30.             printf("default \n");
  31.             for(int i =0;i<str_len;i++){
  32.                 conv_data[i]=toupper(data[i]);
  33.  		/*Direct way conver toupper for  uppercase conversion ,tolower                                         for   lowercase conversion*/
  34.             }
  35.             break;
  36.         }
  37.  
  38.     }
  39.     return conv_data;
  40. }
  41.  
  42. void callby_func(char(*callback_fn(char* ,int )),char *data,int type)    {
  43.     char strret[strlen(data)+1];
  44.     strcpy(strret,callback_fn(data ,type ));
  45.     printf("conv string %s\n",strret);
  46. }
  47. int main()    
  48. {    
  49.     char strval[10]="AbcDZEf";
  50.     void (*ptr_func)(char*,char*,int);
  51.     ptr_func=callby_func;
  52.     (*ptr_func)(conv_string,strval,1);
  53.  
  54.     printf("conv string %s\n",conv_string(strval,1));
  55.     return 0;    
  56. }  
  57.  
Success #stdin #stdout 0s 5284KB
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conv string ABCDZEF
conv string ABCDZEF
https://ideone.com/Z8Y9DV
language:
C (gcc 8.3)
created:
5 days ago
visibility:
public

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