Matrix Transponse

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

int main(){

    float D[20][20], a, b, B[20][20], trD[20][20], trB[20][20];
    int m, i, j;

    printf("Matrix size = ");
    scanf("%d", &m);

    printf("Min = ");
    scanf("%d", &a);

    printf("Max = ");
    scanf("%d", &b);

    for(i = 0; i < m; i++){
        for(j = 0; j < m; j++){
            do{
                printf("D[%d][%d] = ", i, j);
                scanf("%f", &D[i][j]);
                }while(D[i][j]<-1000 || D[i][j]>1000);
        }
    }
    printf("\nElements\n");
        for(i = 0; i < m; i++){
            for(j = 0; j < m; j++){
                printf("| %.3f |", D[i][j]);
            if(D[i][j]<a || D[i][j]>b){
                B[i][j] = D[i][j]*2;
            } else{
                B[i][j] = D[i][j];
            }
        }
    }

    printf("\n\nNot transponded D\n");

        for(i = 0; i < m; i++){
            for(j = 0; j < m; j++){
                printf("| %.3f |", D[i][j]);
        }
        printf("\n");
    }

    printf("\nNot transponded B\n");

        for(i = 0; i < m; i++){
            for(j = 0; j < m; j++){
                printf("| %.3f |", B[i][j]);
        }
        printf("\n");
    }

        for(i = 0; i < m; i++){
            for(j = 0; j < m; j++){
                trD[i][j] = D[j][i];
                trB[i][j]   = B[j][i];
        }
    }

    printf("\nTransponded D\n");

    for(i = 0; i < m; i++){
            for(j = 0; j < m; j++){
                printf("| %.3f |", trD[i][j]);
        }
        printf("\n");
    }

    printf("\nTransponded B\n");

    for(i = 0; i < m; i++){
            for(j = 0; j < m; j++){
                printf("| %.3f |", trB[i][j]);
        }
        printf("\n");
    }

    return 0;

}