等比数列实现

base/dengbishulie.c

@@ -0,0 +1,25 @@
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int main(int argc, char *argv[]) {
+ 
+  if(argc != 4) {
+    return -1;
+  }
+  int a1 = atoi(argv[1]);
+  int q = atoi(argv[2]);
+  int n = atoi(argv[3]);
+  printf("a1=%d, n=%d,q=%d\n", a1, n, q);
+  int i=0;
+  int sum = 0;
+  int a = a1;
+  while (i < n) {
+    sum += a;
+    a *= q;
+    i++;
+  }
+  printf("sum=%d\n", sum);
+  return 0;
+}
+