ch05: new chapter

05-record-like/struct/metro_write.c

@@ -0,0 +1,46 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+#define LEN 3
+
+struct MetroArea {
+    int year;
+    char name[12];
+    char country[2];
+    float population;
+};
+
+int main(int argc, char* argv[]) {
+    struct MetroArea metro[LEN];
+    int rank;
+
+    metro[0].year = 2018;
+    strcpy(metro[0].name, "Tokyo");
+    metro[0].country[0] = 'J';
+    metro[0].country[1] = 'P';
+    metro[0].population = 43868229.0;
+
+    metro[1].year = 2015;
+    strcpy(metro[1].name, "Shanghai");
+    metro[1].country[0] = 'C';
+    metro[1].country[1] = 'N';
+    metro[1].population = 38700000.0;
+
+    metro[2].year = 2015;
+    strcpy(metro[2].name, "Jakarta");
+    metro[2].country[0] = 'I';
+    metro[2].country[1] = 'D';
+    metro[2].population = 31689592.0;
+
+    FILE* data;
+    if ( (data = fopen("metro_areas.bin", "wb")) == NULL ) {
+        printf("Error opening file\n");
+        return 1;   
+    }
+
+    fwrite(metro, sizeof(struct MetroArea), LEN, data);
+    fclose(data);
+
+    return 0;
+}