Application 1 INSAT MPI ( programmation C )

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


void main() {

    // vars

    char ch1[50],ch2[50],ch3[50];

    // getting chars

    puts("gimme ch1 \n");
    gets(ch1);
    puts("gimme ch2 \n");
    gets(ch2);

    // ops

    printf("ch1 is equal to \" %s \" \n",ch1);
    printf("ch2 is equal to  \" %s \" \n",ch2);

    // comp

    int comp;

    comp = strcmp(ch1,ch2);

    switch(comp) {

        case 0: printf("ch1 = ch2 \n"); break;
        case 1: printf("ch1 > ch2 \n"); break;
        case -1: printf("ch1 < ch2 \n"); break;
        default: printf("WTF !! \n"); break;
    }


     // concatination

     strcpy(ch3,ch1);

     strcat(ch3,ch2);

     printf("ch1 + ch2 = '%s' \n", ch3);

     // num values

     printf(" the numeric values of ch1 and 2 are %d and %d \n",atoi(ch1),atoi(ch2));

     // identification

    printf(" ch1 is upper ? %d \n",isupper(ch1[0]));
    printf(" ch2 is upper ? %d \n",isupper(ch2[0]));


    printf(" ch1 is lower ? %d \n",islower(ch1[0]));
    printf(" ch2 is lower ? %d \n",islower(ch2[0]));

    printf(" ch1 is decimal ? %d \n",isdigit(ch1[0]));
    printf(" ch2 is decimal ? %d \n",isdigit(ch2[0]));

    printf(" ch1 is space ? %d \n",isspace(ch1[0]));
    printf(" ch1 is space ? %d \n",isspace(ch1[0]));
}