How can I show DTFT result in MATLAB? I wanna show DTFT result and convolution result in f-domain are same. 

Additionally, I wanna show sampled function and inverse fourier transform result are same too.

How can I show this? If I use just FFT or DFT, they don't show picture-like.
If I have to use other function (e.g diric, freqz, etc), then please let me know how can I use, and input value mean.
The DTFT is continuous, so you have to approximate the DTFT on a computer.

Zero padding “interpolates” the DFT, so  a lot of zero padding will approximate the DTFT