init

test/file.c

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <string.h>
+
+int main(){
+    FILE *fp = fopen("example.txt","r+");
+    if(fp == NULL){
+        printf("error,cannot open file");
+        return 1;
+    }
+    char buffer[100];
+    fread(buffer,sizeof(char),100,fp);
+    printf("%s\n",buffer);
+    char *wt = "hello, World1!";
+    fwrite(wt,sizeof(char),strlen(wt),fp);
+
+    fclose(fp);
+}