engineer.c

// Some functions I coded to help a friend that was
// enrolled in an Engineering School
// 2019-05-19

#include <stdio.h>
#include <stdlib.h>


char ** reverse(int argc, char * argv[]) {
    char ** new_argv = malloc(sizeof(char *) * argc);
    for (int i = 0 ; i != argc ; i++) {
        new_argv[i] = argv[argc - 1 - i];
    }
    
    return new_argv;
}

int size_of_string(char * str) {
    int l = 0;
    
    while (str[l]) {
        l++;
    }
    
    return l;
}

void copy_string(char * dst, int * i_write, char * src) {
    int i = 0;
    
    while (src[i]) {
        dst[*i_write] = src[i];
        *i_write = *i_write + 1;
        i++;
    }
}

char * sum_of_param(int argc, char * argv[]) {
    int size = 0;
    
    for (int i = 0 ; i != argc ; i++) {
        size += size_of_string(argv[i]);
    }
    
    char * concat = malloc(sizeof(char) * (size + 1));
    
    int i_write = 0;
    
    for (int i = 0 ; i != argc ; i++) {
        copy_string(concat, &i_write, argv[i]);
    }
    
    concat[size] = 0;
    return concat;
}



int main_sop(int argc, char * argv[]) {
    printf("<%s>\n", sum_of_param(argc, argv));
	return 0;
}

/*
@DESKTOP-IDJICF1:/mnt/b/azaf$ ./a abou  arr 456 2ra 1
<./aabouarr4562ra1>
*/

int mainreverse(int argc, char * argv[]) {
	char ** rev = reverse(argc, argv);
	for (int i = 0 ; i != argc ; i++) {
		printf("%s ", rev[i]);
	}
	printf("\n");
	return 0;
}


//


int **my_reverse_arr2(int **arr, unsigned int size_x, unsigned int size_y) {
    // Initialization
    int ** res = malloc(sizeof(int) * size_y);
    for (int i = 0 ; i != size_y ; i++) {
        res[i] = malloc(sizeof(int) * size_x);
    }
    
    // Fill
    for (int i = 0 ; i != size_y ; i++) {
        for (int j = 0 ; j != size_x ; j++) {
            res[i][j] = arr[j][i];
        }
    }
    
    return res;
}


void printtab(int ** tab, int x, int y) {
    for (int i = 0 ; i != x ; i++) {
        for (int j = 0 ; j != y ; j++) {
            printf("%d ", tab[i][j]);
        }
        printf("\n");
    }
}

int main(int argc, char * argv[]) {
    int n = 0;
    int x = 3;
    int y = 2;
    int ** origine = malloc(sizeof(int) * x);
    
    for (int i = 0 ; i != x ; i++) {
        origine[i] = malloc(sizeof(int) * y);
        for (int j = 0 ; j != y ; j++) {
            origine[i][j] = n++;
        }
    }
    
    int ** transpoee = my_reverse_arr2(origine, x, y);
    
    printtab(origine, x, y);
    printf("\n");
    printtab(transpoee, y, x);
}