K and R C, Solution to Exercise 1-24:
C program for rudimentary syntax errors like unbalanced parentheses, brackets,quotes,and braces. This program is hard if we do it in full generality. K and R C Program Exercises provides the solution to all the exercises in the C Programming Language, second addition, by Brian W.Keringhan and Dennis M.Ritchie(Prentice Hall,1988). You can learn and solve K&R C Programs Exercise. Read more about C Programming Language .

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#include <stdio.h>

#define MAXLINE 1000 /* max input line size */
char line[MAXLINE]; /*current input line*/

int getline(void); /* taken from the KnR book. */

int main() {
 int len = 0;
 int t = 0;
 int brace = 0, parenthesis = 0, brack = 0;
 int s_quote = 1, d_quote = 1;

 while ((len = getline()) > 0) {
  t = 0;
  while (t < len) {
   if (line[t] == '{') {
    brace++;
   }
   if (line[t] == '}') {
    brace--;
   }
   if (line[t] == '[') {
    brack++;
   }
   if (line[t] == ']') {
    brack--;
   }
   if (line[t] == '(') {
    parenthesis++;
   }
   if (line[t] == ')') {
    parenthesis--;
   }
   if (line[t] == ''') {
    s_quote *= -1;
   }
   if (line[t] == '"') {
    d_quote *= -1;
   }
   t++;
  }
 }
 if (d_quote != 1)
  printf("Mismatching double quote markn");
 if (s_quote != 1)
  printf("Mismatching single quote markn");
 if (parenthesis != 0)
  printf("Mismatching parenthesisn");
 if (brace != 0)
  printf("Mismatching bracesn");
 if (brack != 0)
  printf("Mismatching bracket markn");
 if (brack == 0 && brace == 0 && parenthesis == 0 && s_quote == 1 && d_quote
   == 1)
  printf("Syntax appears to be correct.n");
 return 0;
}

/* getline function */
int getline(void) {
 int c, i;
 extern char line[];

 for (i = 0; i < MAXLINE - 1 && (c = getchar()) != EOF && c != 'n'; ++i)
  line[i] = c;
 if (c == 'n') {
  line[i] = c;
  ++i;
 }
 line[i] = '