Исходный код программы

Lab 09.03.22/main.cpp

+#include <iostream>
+#include <cmath>
+
+long factorial(long n) {
+    return (n==0) || (n==1) ? 1 : n*factorial(n-1);
+}
+double g(double x, int i) {
+    return std::pow(x, i)*factorial(i)/factorial(2*i+1);
+}
+
+double Fx(double x, int n)
+{
+    double fx = 0;
+    for(int i = 1; i <= n; i++) {
+        fx = fx + g(x, i);
+    }
+    return fx;
+}
+
+const char* getTextFileName() {
+    return "file.txt";
+}
+const char* getBinaryFileName() {
+    return "file.bin";
+}
+bool writeToTextFile(double v) {
+    FILE* f = fopen(getTextFileName(), "wt+");
+    bool isOK = fprintf(f, "%lf", v) > 0;
+    fclose(f);
+    return isOK;
+}
+bool writeToBinaryFile(double v) {
+    FILE* f = fopen(getBinaryFileName(), "w+");
+    bool isOK = fwrite(&v, sizeof(v), 1, f) == 1;
+    fclose(f);
+    return isOK;
+}
+double readFromTextFile() {
+    FILE* f = fopen(getTextFileName(), "rt");
+    double v=0;
+    bool isOK = fscanf(f, "%lf", &v) > 0;
+    fclose(f);
+    return v;
+}
+double readFromBinaryFile() {
+    double v = 0;
+    FILE* f = fopen(getBinaryFileName(), "r");
+    bool isOK = fread(&v, sizeof(v), 1, f) == 1;
+    fclose(f);
+    return v;
+}
+
+int main(int argc, const char * argv[]) {
+    double x;
+    int count;
+    std::cout << "x=";
+    std::cin >> x;
+    std::cout << "count=";
+    std::cin >> count;
+    std::cout << Fx(x, count) << std::endl;
+    double fx = Fx(x, count);
+    writeToTextFile(fx);
+    writeToBinaryFile(fx);
+    double fxt = readFromTextFile();
+    double fxb = readFromBinaryFile();
+    std::cout << "from text = " << fxt << std::endl;
+    std::cout << "from binary = " << fxb << std::endl;
+    return 0;
+}