started assignment and added programs

programs/p25/info.json

@@ -0,0 +1,10 @@
+{
+  "language": "C",
+  "name": "演習課題1 演習2ー5",
+  "description": "2つの整数値を読み込み、前者の値が後者の値の何%であるかを倍精度浮動小数点数として表示するプログラム。",
+  "output": {
+    "type": "screenshot",
+    "content": "./assets/p25.png"
+  },
+  "note": ""
+}

programs/p25/main.c

@@ -0,0 +1,14 @@
+#include <stdio.h>
+
+int main(void) {
+    int a, b;
+
+    printf("Integer a: ");
+    scanf("%d", &a);
+    printf("Integer b: ");
+    scanf("%d", &b);
+
+    printf("Value of a is %f%% of b.\n", (double)a / (double)b * 100.0);
+
+    return 0;
+}