final vers

a2/program.c

@@ -8,20 +8,20 @@
 struct stack{
     char data[100];
     int size;
-}s;
+}stack;
 
 void push(char ch){
-    if(s.size < 100){
-        s.size++;
-        s.data[s.size] = ch;
+    if(stack.size < 100){
+        stack.size++;
+        stack.data[stack.size] = ch;
     }
     else
         exit(0);
 } 
 
 void pop(){
-    if(s.size >= 0)
-        s.size--;
+    if(stack.size >= 0)
+        stack.size--;
     else 
         exit(0);
 }
@@ -54,62 +54,67 @@ char right_pair(char a){
 }
 
 char gettop(){
-    return s.data[s.size];
+    return stack.data[stack.size];
 }
 
 int main(){
     
     
     char line[100];
-    s.size = -1;
+    stack.size = -1;
 
     printf("Read: ");
     char *x = fgets(line, 100, stdin);
     printf("%s", line);
 
     int l = strlen(line);
-    int i, j = -1;
-    char *a = calloc(l, sizeof(char));
-    char *b = calloc(l, sizeof(char));
+    int i, j = -1, f = -1;;
+    char *l_bracket = calloc(l, sizeof(char));
+    char *r_bracket = calloc(l, sizeof(char));
      
     for(i = 0; i < l; i++){
         if(line[i] == '{' || line[i] == '(' || line[i] == '[' || line[i] == '<'){
             push(line[i]);
             j++;
-            a[j] = gettop();
-            b[j] = right_pair(a[j]);
+            f++;
+            l_bracket[j] = gettop();
+            r_bracket[f] = right_pair(l_bracket[j]);
         }
         if(line[i] == '}' || line[i] == ')' || line[i] == ']' || line[i] == '>'){   
-            if(s.size == -1){
+            if(stack.size == -1){
                 printf("Unexpected closing bracket %c in %d\n", line[i], i);
                 return 0; 
 
             }
             else if(!find_pair(gettop(), line[i])){
-                printf("Crossed bracket %c in %d, expected %c\n", line[i], i, b[j]);
+                printf("Crossed bracket %c in %d, expected %c \n", line[i], i, r_bracket[j]);
                 return 0;            
             }
             else{
+                 r_bracket[f] = 0;
+                 f--;
                  pop();
             }
         }
     }
+   
     int begin = 0;
-    int end = strlen(b);
-    int h;
+    int end = strlen(r_bracket);
+    int temp;
+    //printf("%s", b);
     while(begin < end){
-        h = b[begin];
-        b[begin++] = b[--end];
-        b[end] = h;
+        temp = r_bracket[begin];
+        r_bracket[begin++] = r_bracket[--end];
+        r_bracket[end] = temp;
     }
 
-    if(s.size == -1){
+    if(stack.size == -1){
         printf("All brackets OK\n");
     }
     else {
-        printf("Missing closing brackets: %s \n", b);        
+        printf("Missing closing brackets: %s\n", r_bracket);        
     }
-    free(a);
-    free(b);
+    free(l_bracket);
+    free(r_bracket);
     return 0;
 }