diff --git a/QUSTOJ/1715.c b/QUSTOJ/1715.c
new file mode 100644
index 0000000..b879daa
--- /dev/null
+++ b/QUSTOJ/1715.c
@@ -0,0 +1,37 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+/// itoa implement
+char* int2str(int num,char* buff,int bina)
+{
+	char k[16]={'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
+	if(bina==10)
+	{
+		sprintf(buff,"%d",num);
+		return buff;
+	}
+	int cnt=0;
+	while(num>0)
+	{
+		buff[cnt]=k[num%bina];
+		num=num/bina;
+		cnt++;
+	}
+	buff[cnt]=0;
+	for(int i=0;i<cnt/2;i++)
+	{
+	    char t=buff[i];
+	    buff[i]=buff[cnt-i-1];
+	    buff[cnt-i-1]=t;
+	}
+	return buff;
+}
+
+char buff[32];
+int a,b;
+int main()
+{
+    scanf("%d %d",&a,&b);
+    printf("%s\n",int2str(a,buff,b));
+    return 0;
+}