C Version

diamond.c

int main(){
        int inputInt,oddRslt;
        char awsr;
        int checkNum(int inputInt);
        int printDmd(int inputInt);
        int repeat(char awsr);
        int again=1;
    
        /*main loop, loops entire program, ends on exit */
        while(again != 0){
        /*takes input*/
        do{
            printf("enter ODD size > 0:");
                scanf("%i",&inputInt);
                while (getchar() != '\n');
            oddRslt=checkNum(inputInt);
           } while(oddRslt != 1);
        
            /*calls printDmd*/
            printDmd(inputInt);
        
            /*more prompt*/
            printf("more?\n");
            /*more answer*/
            awsr = getchar();
            while (getchar() != '\n');
            again=repeat(awsr);
            inputInt=0;
    }   
    /* if again == 0 termiantes) */
    printf("Goodbye!\n");
    return 0;
}

/* number check, if odd,even,negative, or zero*/
int checkNum(int inputInt){
    
    int isOdd, oddChk;
    
    if(inputInt==0){
        printf("Zero or noninteger, Please enter an odd integer.\n");
    }
    else if(inputInt < 0){
            printf("Not a positive odd integer.\n");
            isOdd=0;
            return isOdd;
        }
        else{
            oddChk = inputInt % 2;
            if(oddChk == 1){
                isOdd=1;
                return isOdd;
            }
        
            else{
                printf("You entered an even integer," 
                     " please enter an odd intger.\n");
                isOdd=0;
                return isOdd;
            }
        }
}

/*prints diamond*/
int printDmd(int inputInt){
    
    int space,t,s,a,n,askT,askC;
    n=inputInt;
    space=(n/2);
    askC=1;
    askT=1;
    
    for(t=1;t<=n;t++){
        
        if(space<0)
            s=space*-1;
        else s=space;
        
        for(s;s>0;s--){
            printf(" ");
        }
        for(a=1;a<=askT;a++){
            printf("*");
        }
        if(askC<((n/2)+1)){
            askT+=2;
            askC++;
        }
        else if(askC>=((n/2+1))){
            askT-=2;
        }
        printf("\n");
        if(space<=(n/2))
            space--;
    }
    return 1;
}

/*evlautes response to more and sets again's value*/
int repeat(char awsr){
    int again;
    if((awsr=='Y') || (awsr== 'y'))
        again=1;
    else
        again=0;
    return again;
}