Init

0225/1.c

@@ -0,0 +1,9 @@
+#include <stdio.h>
+#define PI 3.14159265358979323846
+
+int main() {
+    double r;
+    scanf("%lf", &r);
+    printf("%f\n%f", 4 * PI * r * r, PI * r * r * r * 4 / 3);
+    return 0;
+}

0225/2.c

@@ -0,0 +1,9 @@
+#include <math.h>
+#include <stdio.h>
+#define square(x) ((x) * (x))
+
+int main() {
+    int x1, y1, x2, y2;
+    scanf("%d %d %d %d", &x1, &y1, &x2, &y2);
+    printf("%f", sqrt(square(x2 - x1) + square(y2 - y1)));
+}

0225/3.c

@@ -0,0 +1,8 @@
+#include <stdio.h>
+
+int main() {
+    int num;
+    scanf("%d", &num);
+    printf("%d %d %d\n", num / 100, num / 10 % 10, num % 10);
+    return 0;
+}

0225/4.c

@@ -0,0 +1,11 @@
+#include <stdio.h>
+
+int main() {
+    char a, b;
+    scanf("%c %c", &a, &b);
+    char c = a;
+    a = b;
+    b = c;
+    printf("%c %c", a, b);
+    return 0;
+}

0225/5.c

@@ -0,0 +1,6 @@
+#include <stdio.h>
+int main(){
+    char c;
+    scanf("%c", &c);
+    printf("%c %c\n%d %d %d", c, c + 1, c - 1, c, c + 1);
+}

0225/txt

@@ -0,0 +1 @@
+p32-33