new program added

Author: arorarahul

questions/question23.c

@@ -0,0 +1,31 @@
+/*
+ A file "input.txt" contains a some lines of text. Collect the name of the file from the user, and then
+   use the C "system()" function, and the standard UNIX command "wc", to find the number
+   of lines, words and characters in the file. Ensure that the file is readable before trying the "system()"
+   function.
+   INPUT: read file name from command line as: ./a.out input.txt
+   OUTPUT: the number of lines, words characters in the file "input.txt"                                        [2 marks]
+
+*/
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(int argc, char *argv[]){
+
+   char *str = malloc(sizeof(char)*100);
+
+   strcpy(str, "wc ");
+   strcat(str, argv[1]);
+
+   printf("%s\n", str);
+
+   if(argc > 1){
+      FILE *fp = fopen(argv[1],"r");
+      if(fp != NULL){
+         system(str);
+      }
+      fclose(fp);
+   }
+
+}