Frequency of all charecter in a Paragraph

#include <stdio.h>

int main(){

    char paragraph[] = "AMERICAN INTERNATIONAL UNIVERSITY-BANGLADESH (AIUB) envisions promoting professionals and excellent leadership catering to the technological progress and development needs of the country.";

    int i, frequency[256] = {0};

    for(i=0; paragraph[i] != '\0'; i++)
    {
        frequency[paragraph[i]]++;
    }

    printf("Character   \tFrequency\n");
    for(i=0; i < 256; i++)
    {
        if(frequency[i] != 0)
        {
            printf(" %c \t\t%d\n",i,frequency[i]);
        }
    }

    return 0;
}