these are 3 functions and I need these functions to C++

I need this all C code converting to C++.

Please convert this code to C++

Function for CAT :

#include #include #include #include int main(int argc,char *argv[]) { // fd - file descriptor int fd, i, chr; for (i = 1; i < argc; i++) { // open file in read only mode fd = open(argv[1], O_RDONLY); // error handlings if(fd < 0) { perror("Unable to open file!"); return -1; } // reading file byte by byte while(read(fd, &chr, 1)) // writing byte to stdout write(STDOUT_FILENO, &chr, 1);

// closing fd close(fd); } return 0; }

FUNCTION FOR GREP

#include #include #include

int main(int argc,char *argv[]) {

// reading file FILE *fp = fopen(argv[2], "r");

// error handling if(fp == NULL) { perror("Unable to open file!"); return -1; }

// declaring chunk // will use it for every line char chunk[128];

// iterating over file line by line while(fgets(chunk, sizeof(chunk), fp) != NULL) { // checking if pattern exists in line if(strstr(chunk, argv[1])){ // setting the line to stdout fputs(chunk, stdout); } }

fclose(fp); return 0; }

FUNCTION FOR ZIP

#include #include #include #include #define MAX_RLEN 500

int getSize(char * s) { char * t; for (t = s;* t != '\0'; t++) ; return t - s; }

char * zip(char * str);

int main(int argc,char *argv[]) {

FILE *fp; char *buffer; long bytes;

fp = fopen ( argv[1] , "rb" );

if( fp == NULL ){ perror("Unable to open file!"); return -1; }

// get number of bytes in file fseek( fp , 0L , SEEK_END); bytes = ftell( fp ); // reset seek to start fseek( fp, 0L, SEEK_SET);

// allocate memory for entire content buffer = (char*)calloc(bytes, sizeof(char)); fread(buffer, sizeof(char), bytes, fp); fclose(fp);

// using zip function for RLE char * encoded = zip(buffer); fputs(encoded, stdout);

return 0;

}

char * zip(char * str) { int rLen; char count[MAX_RLEN]; int len = strlen(str);

// dynamic allocation for final encoding char * dest = (char * ) malloc(sizeof(char) * (len * 2 + 1));

int i, j = 0, k;

// iterating over the input string for (i = 0; i < len; i++) {

// copy first occurence of the new chahrater dest[j++] = str[i];

// counting occurence of caharacter rLen = 1; while (i + 1 < len && str[i] == str[i + 1]) { rLen++; i++; }

// storing repeat occurences in character array count sprintf(count, "%d", rLen);

// copy occurence count to destination for (k = 0;*(count + k); k++, j++) { dest[j] = count[k]; } }

// terminating the destination string dest[j] = '\0'; return dest; }