C++ Program – CheckSum generator

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//Downloaded From theonlinetutorials.com  //Source code  #include<iostream.h>  #include<stdio.h>  #include<string.h>  #include<conio.h>  #define size 100  unsigned short int checksum(char []);  void valch(unsigned short int check,char message[]);  int main(){   clrscr();   cout<<" Enter any thing :";   char message[size]={0};   cin>>message;   unsigned short int check=checksum(message);   getch();   valch(check,message);   getch();   return 0;   }  void valch(unsigned short int check,char message[]){   unsigned short int t[size],ch=0;   int i,j,n;   cout<<endl<<endl;   cout<<"Checking Checksum"<<endl;   for(i=0,j=0;i<strlen(message);i=i+2,j++){   t[j]=message[i];   t[j]=t[j]<<8;   t[j]=t[j]+message[i+1];   }   n=j;   for(i=0;i<n;i++){   printf("%X\n",t[i]);   ch+=t[i];   }   printf("%X\n",check);   ch+=check;   printf("----\n");   printf("%X\n",ch);   printf("   1\n");   printf("----\n");   ch++;   printf("%X\n",ch);   ch=~ch;   printf("%4X\n",ch);   if(ch==0)   cout<<"Checksum is valid";   else   cout<<"Checksum is invalid";   }  unsigned short int checksum(char message[]){   unsigned short int t[size];   unsigned short int check=0;   int i,j,n;   cout<<"Generating Checksum"<<endl;   for(i=0,j=0;i<strlen(message);i=i+2,j++){     //Divide Message into 16-bit field   t[j]=message[i];   t[j]=t[j]<<8;   t[j]=t[j]+message[i+1];   }   n=j;     for(i=0;i<n;i++){   printf("%X\n",t[i]);   check+=t[i];   }   printf("0000\n");   printf("----\n");   printf("%X\n",check);   printf("   1\n");   check+=1;   printf("----\n");   printf("%X\n",check);   check=~check;   printf("%X\n",check);   cout<<"Checksum is generated at it is"<<endl;   printf("%X\n",check);   return check;   }  



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  1. check sum c++ generator is good working. thanku lot sir . I faced some coding error in check sum c++ .. and now corrected. tks

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