diff --git a/du3/program.c b/du3/program.c
index b6ddca0..6550ae5 100644
--- a/du3/program.c
+++ b/du3/program.c
@@ -9,6 +9,7 @@ int main(){
 	char *endptr = NULL;
 	float result = 0;
 	int a;
+	memset(riadok, 0,SIZE);
 	for(int i = 0; i < SIZE; ){
 		char* r = fgets(riadok,SIZE,stdin);
 		if(*r != '\n'){