K & R C Programs Exercise 7-8.

Posted on February 7, 2012 by Sandeepa Nadahalli

K and R C, Solution to Exercise 7-8:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
C Program to print a set of files, starting each new one on a new page, with a title and running page for each file Read more about C Programming Language .

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***********************************************************/

#include<stdio.h>
#include<stdlib.h>

#define MAXBOT 3
#define MAXHDR 5
#define MAXLINE 100
#define MAXPAGE 66

/*print: print files - each new one on a new page  */
main(int argc, char *argv[])
{

 FILE *fp;
 void fileprint(FILE *fp, char *fname);

 if(argc == 1)
  fileprint(stdin," ");
 else
  if((fp = fopen(*++argv,"r")) == NULL) {
   fprintf(stderr,"find:can't open %sn",*argv);
   exit(1);
  } else {

   fileprint(fp, *argv);
   fclose(fp);
  }
 return 0;
}


//fileprint: print file name
void fileprint(FILE *fp, char *fname)
{
 int lineno, pageno = 1;
 char line[MAXLINE];
 int heading(char *fname, int pageno);
 lineno = heading(fname, pageno++);
 while(fgets(line, MAXLINE, fp) != NULL) {
  if(lineno == 1) {
   fprintf(stdout,"f");
   lineno = heading(fname, pageno++);
  }
  fputs(line, stdout);
  if(++lineno > MAXPAGE - MAXBOT)
   lineno = 1;
 }
 fprintf(stdout,"f");
}

//heading: put heading and enough blank lines
int heading(char *fname, int pageno)
{
 int ln = 3;
 fprintf(stdout,"nn");
 fprintf(stdout,"%s page %dn", fname, pageno);
 while(ln++ < MAXHDR)
  fprintf(stdout,"n");
 return ln;
}

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K & R C Programs Exercise 7-6.

Posted on February 7, 2012 by Sandeepa Nadahalli

K and R C, Solution to Exercise 7-6:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
Write a C Program to compare two files, printing the first line where they differ.
Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/

#include<stdio.h>
#include<stdlib.h>
#include<string.h>

#define MAXLINE 100
/*comp: compare two file, printing the first line where they differ*/
main(int argc, char *argv[])
{
 FILE *fp1, *fp2;
 void filecomp(FILE *fp1, FILE *fp2);
 if(argc != 3){
  fprintf(stderr,"comp:need two file namesn");
  exit(1);
 } else {
  if((fp1 = fopen(*++argv, "r")) == NULL) {
   fprintf(stderr, "comp:can't open %sn",*argv);
   exit(1);
  } else if((fp2 = fopen(*++argv, "r")) == NULL) {
   fprintf(stderr, "comp:can't open %sn",*argv);
   exit(1);
  }else  {
   filecomp(fp1,fp2);
   fclose(fp1);
   fclose(fp2);
   exit(0);

  }
 }
}

//filecomp: compare two files -a line at a time
void filecomp (FILE *fp1, FILE *fp2)
{
 char line1[MAXLINE], line2[MAXLINE];
 char *lp1 = *lp2;
 do{
  lp1 = fgets(line1, MAXLINE, fp1);
  lp2 = fgets(line2, MAXLINE, fp2);
  if(lp1 == line1 && lp2 == line2){

   if(strcmp(line1,line2) !=0) {
    printf("First difference in linen%sn",line1);
    lp1 = lp2 = NULL;
   }
  } else if(lp1 != line1 && lp2 == line2)
   printf("end of first file at linen%sn",line2);
  else if(lp1 == line1 && lp2 == line2)
   printf("end of second file at line n%sn",line1);

 }while(lp1 == line1 && lp2 == line2);
}

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K & R C Programs Exercise 7-5.

Posted on February 7, 2012 by Sandeepa Nadahalli

K and R C, Solution to Exercise 7-5:
K and R C Programs Exercises provides the solution to all the exercises in the C Programming Language (2nd Edition). You can learn and solve K&R C Programs Exercise.
Rewrite the postfix calculator of chapter 4 to use scanf and/or sscanf to do the input number conversion.
Read more about C Programming Language .

/***********************************************************
* You can use all the programs on  www.c-program-example.com
* for personal and learning purposes. For permissions to use the
* programs for commercial purposes,
* contact info@c-program-example.com
* To find more C programs, do visit www.c-program-example.com
* and browse!
* 
*                      Happy Coding
***********************************************************/



#include<stdio.h>
#include<math.h>       /*for atof()*/
#define MAXTOP 100     /* max size of operand or operator  */
#define NUMBER  '0'    /* SIGNAL THAT A NUMBER WAS FOUND   */
#define MAXVAL 100
int gettop(char []);
void push(double);
double pop(void);
int sp = 0;          /* Next free stack position. */
double val[MAXVAL];  


//reverse Polish calulator
int main(void)
{
 int type;
 double op2;
 char s[MAXOP];

 while((type = getop(s)) != EOF)
 {
  switch(type)
  {
  case NUMBER:
   push(atof(s));
   break;
  case '+':
   push(pop() + pop());
   break;
  case '*':
   push(pop() * pop());
   break;

  case '-':
   op2=pop();
   push(pop() - op2);
   break;
  case '-':
   op2=pop();
   if(op2 != 0.0)
    push(pop() / op2);
   else printf("nError: Zero divissorn");
   break;
  case '%':
   op2 = pop();
   if(op2)
    push(fmod(pop(), op2));
   else
    printf("nError: Division by zero!");
   break;
  case 'n':
   printf("t%.8gn",pop());
   break; 
  default:
   printf("error: unknown command %sn", s);
   break;

  }
 }
 return 0;
}




/* Getop: get next operator or numeric operand. */
int getop(char s[])
{

 int i = 0;
 int c;
 int rc;
 static char lastc[] = " ";
 sscanf(lastc,"%c", &c);
 lastc[0] = ' ';

 /* Skip whitespace */
 while((s[0] = c ) == ' ' || c == 't')
  if(scanf("%",&c) == EOF)
   c = EOF;
 s[1] = '

C Program Examples

c language

K & R C Programs Exercise 7-8.

K & R C Programs Exercise 7-6.

K & R C Programs Exercise 7-5.