Daily 5 C programs-1

1. Write a program to print the value of EOF.?
Solution:

   /*************Program1***********/
   #include<stdio.h>
   int main()
   {
       int ch=getchar();
       printf("%d",ch);
       return;
   }
   ---------------------------------------
   /*************Program2***********/
   #include<stdio.h>
   int main()
   {
       printf("%d",EOF);
       return;
   }

   
   In Windows if you enter the keys Control + Z you get EOF, in Linux it is Control + D
   Output: -1
2. Write a program to read input from user and store it in a string until EOF(ctrl+d pressed in linux)
   Solution1

   #include<stdio.h>
   int main()
   {
       char str[100];
   
       printf("Enter the string with maximum 100 
   characters\n");
       scanf("%[^EOF]",str);
       printf("%s",str);
       return;
   }

   Solution2

   #include<stdio.h>
   
   int main()
   {
       char buf[512];
   
       int ch;
       int i=0,tab=0,line=0,blank=0;
   
       printf("Enter the line of text.
   Press ctrl+d to finish\n");
   
       while((ch=getchar())!=EOF)
   
       {
           buf[i++]=ch;
   
       }
       printf("The entered string is %s\n",buf);
   
       return;
   }

   
   Output:
   Enter the string with maximum 100 characters
   Hello world
   Welcome to my blog
   Hello world
   Welcome to my blog
   
   
3. Write a Program to count blanks,tabs,newline?
Solution:

   /*Program to read input from user and store 
   it in a string until EOF(ctrl+d pressed)*/
   #include<stdio.h>
   int main()
   {
       char buf[512];
       int ch;
       int i=0,tab=0,line=0,blank=0;
       printf("Enter the line of text.
   Press ctrl+d to finish\n");
       while((ch=getchar())!=EOF)
       {
           buf[i++]=ch;
           if(ch=='\t')
               tab++;
           else if(ch=='\n')
               line++;
           else if(ch==' ')
               blank++;
   
       }
       printf("The entered string is %s\n",buf);
       printf("No of blanks=%d\n",blank);
       printf("No of tab=%d\n",tab);
       printf("No of Lines=%d\n",line); 
       return;
   }

   Output:
   Enter the line of text.Press ctrl+d to finish
   Hello world        Welcome
   How are you?
   Did you Like my Blog          
   The entered string is Hello world        Welcome
   How are you?
   Did you Like my Blog
   
   No of blanks=7
   No of tab=2
   No of Lines=3
   
4. Write a program to copy its input to its output, replacing each string of one or more blanks by a single blank?
   Solution:

   #include<stdio.h>
   int main()
   {
       char txt[100],out[100],ch;
       int i=0,j=0;
       printf("Enter the string\n");
       scanf("%[^EOF]",txt);
       while(txt[i+1]!=EOF)
       {
            ch=txt[i];
           if(ch!=' ' || (ch==' ' && txt[i+1]!=' '))
               out[j++]=ch;
           i++;
       }
       printf("\nOutput String=%s\n",out);
       return;
   }

   Output:
   ./a.out
   Enter the string
   a   s d  a
   Output String=a s d a
   
5. Write a program to copy its input to its output, replacing each tab by \t , each backspace by \b , and each backslash by \\ . This makes tabs and backspaces visible in an unambiguous way.
   Solution:

   #include<stdio.h>
   int main()
   {
       char buf[512];
       int ch,i=0;
       printf("Enter the line of text.
   Press ctrl+d to finish\n");
       while((ch=getchar())!=EOF)
       {
           if(ch=='\t' || ch=='\n' ||  ch==' ')
               buf[i++]='\\';/*to print \*/
           if(ch=='\t')
               buf[i++]='t';
           else if(ch=='\n')
               buf[i++]='n';
           else if(ch==' ')
               buf[i++]='b';
           else/*for all other char*/
               buf[i++]=ch;
       }
       buf[i++]='\0';
       printf("The entered string is %s\n",buf);
       return;
   }

   Output:
   Enter the line of text.Press ctrl+d to finish
   Hello World        Welcome  
   C  Programming
   The entered string is Hello\bWorld\t\tWelcome\b\nC\b\bProgramming\n
   
6. Write a program that prints its input one word per line?
   Solution1:

   #include<stdio.h>
   int main()
   {
       char txt[100],out[100],ch;
       int i=0,j=0;
       printf("Enter the string\n");
       scanf("%[^EOF]",txt);
       while(txt[i]!=EOF)
       {
           ch=txt[i];
           if(ch==' ')
               out[j++]='\n';
           else
               out[j++]=ch;
           i++;
       }
       printf("\nOutput String=%s\n",out);
       return;
   }

   Output:
   Enter the string
   hello World Welcome
   
   Output String=hello
   World
   Welcome