diff --git a/du4/program.c b/du4/program.c
index a5e2978..865d4a4 100644
--- a/du4/program.c
+++ b/du4/program.c
@@ -54,12 +54,13 @@ int main()
     char str[100][100];
   	int i =0;
   	int j =0;
-  	while((c=getchar())!=EOF){
-  	    if(c=='\n'){
+  	char b ;
+  	while((b=getchar())!=EOF){
+  	    if(b=='\n'){
   	        j=0;
   	        i++;
   	    }
-  	    str[i][j]=c;
+  	    str[i][j]=b;
   	    j++;
   	}
   	for(int k=0;k<i;k++){