如何将此代码从 c 更改为 c++

我学了很多C，但不是C ++，只是想知道这段代码在C ++中会是什么样子。 谢谢。 这不是出于好奇，因为我下学期将学习C ++。

#include<stdio.h>
#include<stdlib.h>
#include<math.h>
void rotateCW(FILE * ifp, FILE * ofp);
void rotateCounterCW(FILE * ifp, FILE * ofp);
int main(int argc, char *argv)
{
    FILE *ifp, *ofp;
    int ifpFlag = 0;
    //loops until valid input file is put in
    while(ifpFlag == 0)
    {
        char fnamer[100]="";
        printf("nWhats the input file name?n");
        scanf("%s", &fnamer);
        ifp = fopen(fnamer, "r");
        if (ifp == NULL)
        {
            fprintf(stderr, "Can't open input file in.list!n");
        }
        else
        {
            ifpFlag = 1;
        }
    }
    char outname[100]="";
    printf("nWhats the output file name?n");
    scanf("%s", &outname);
    ofp = fopen(outname, "w");
    if (ofp == NULL)
    {
        fprintf(stderr, "Can't open output file %s!n",
                outname);
        exit(1);
    }
    int flag = 0;
    //loops until valid input or quit
    while(flag == 0)
    {
        //print menu
        int input;
        printf("nChoose an option:n1)Rotate Clockwise 90 degreesn2)Rotate Counter-Clockwise 90 degreesn3)Quitn");
        scanf("%d", &input);
        switch (input)
        {
            case 1:
                rotateCW(ifp,ofp);
                flag = 1;
                break;
            case 2:
                rotateCounterCW(ifp,ofp);
                flag = 1;
                break;
            case 3: //quit
                printf("nProgram Terminatedn");
                flag = 1;
                break;
            default: //valid input was not put in
                printf("Invalid input.n");
                break;
        }
    }
    fclose(ifp);
    fclose(ofp);
    return 0;
}
void rotateCounterCW(FILE * ifp, FILE * ofp)
{
    int length, width;
    fscanf(ifp, "%d", &width);
    fscanf(ifp, "%d", &length);
    int array[length][width];
    int CCWarray[length * width];
    int i, j, k;
    for (i = 0; i < length; i++)
    {
        for (j = 0; j < width; j++)
        {
            fscanf(ifp, "%d", &array[i][j]);
        }
    }
    k = 0;
    for (j = width - 1; j >= 0; --j)
    {
        for (i = 0; i < length; i++)
        {
            CCWarray[k++] = array[i][j];
        }
    }
    fprintf(ofp, "P2n");
    fprintf(ofp, "# Comments here.n");
    fprintf(ofp, "%d %dn", length, width);
    fprintf(ofp, "255n");
    //writing the output file
    for (i = 0; i < (length * width); i++)
    {
        fprintf(ofp, "%d ", CCWarray[i]);
    }
    fprintf(ofp, "n");
    printf("nThe pgm was rotated CCW by 90 degreesn");
}
void rotateCW(FILE * ifp, FILE * ofp)
{
    int length, width;
    fscanf(ifp, "%d", &width);
    fscanf(ifp, "%d", &length);
    int array[length][width];
    int CWarray[length * width];
    int i, j, k;
    for (i = 0; i < length; i++)
    {
        for (j = 0; j < width; j++)
        {
            fscanf(ifp, "%d", &array[i][j]);
        }
    }
    k = 0;
    for (j = 0; j < width; j++)
    {
        for (i = length - 1; i >= 0; --i)
        {
            CWarray[k++] = array[i][j];
        }
    }
    fprintf(ofp, "P2n");
    fprintf(ofp, "# Comments here.n");
    fprintf(ofp, "%d %dn", length, width);
    fprintf(ofp, "255n");
    //writing the output file
    for (i = 0; i < (length * width); i++)
    {
        fprintf(ofp, "%d ", CWarray[i]);
    }
    fprintf(ofp, "n");
    printf("nThe pgm was rotated CW by 90 degreesn");
}