Write a C program to input any two characters and a number (number of lines) from thekeyboarddisplayatriangleasshowninbelowfigure.Thetwocharactersshouldfillthetrianglein every other place

Sure, here is a simple C program that does what you asked for. This program will take two characters and a number as input and then print a triangle pattern with the two characters.

#include <stdio.h>

int main() {
    char ch1, ch2;
    int lines, i, j, k;

    printf("Enter two characters: ");
    scanf("%c %c", &ch1, &ch2);

    printf("Enter number of lines: ");
    scanf("%d", &lines);

    for(i=1; i<=lines; i++) {
        for(j=lines; j>i; j--) {
            printf(" ");
        }
        for(k=1; k<=(2*i-1); k++) {
            if(k%2 == 0)
                printf("%c", ch2);
            else
                printf("%c", ch1);
        }
        printf("\n");
    }

    return 0;
}

This program works by using nested for loops to print the triangle. The outer loop is used to print each line of the triangle, the first inner loop is used to print the spaces before the characters, and the second inner loop is used to print the characters. The if-else statement inside the second inner loop is used to alternate between the two characters.