Programming

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

long dram(long);
int palin(long);
long reverse(long);

main(int argc, char *argv[]) {
	long n;
	if (argc < 2) {
		fprintf(stderr, "usage: %s [number]\n", argv[0]);
		exit(1);
	}
	if (argc == 2) {
		n = atoi(argv[1]);
		printf("%ld\n", dram(n));
	} else {
		while (--argc > 0) {
			n = atoi(*++argv);
			printf("%ld\n", dram(n));
		}
	}
}
long dram(long n) {
	long n2;
	while (palin(n) != 1) {
		n2 = reverse(n);
		n += n2;
	}
	return n;
}
int palin(long n) {
	long n2 = reverse(n);

	if (n == n2) {
		return 1;
	}
	return 0;
}
long reverse(long n) {
	long rev = 0;

	while (n > 0) {
		rev *= 10;
		rev += n%10;
		n /= 10;
	}
	return rev;
}

#include <stdio.h>

int reverseCheck(unsigned long);

int main()
{
  unsigned long number = 2468;
  unsigned long tmp = 0;

  while ( tmp != number ) {
    tmp = reverseCheck(number);
    if( tmp == number ) {
      tmp = number;
    }
    else {
      number += tmp;
    }
  }

  printf("Number:%d\n", number);

  return 0;
}

int reverseCheck(unsigned long number) {
  unsigned int i;
  unsigned long num;
  unsigned long sum;

  for( num = number, i=1; num / 10; i *= 10, num /= 10 );
  for( sum = 0; number > 0; sum += (number % 10) * i, number /= 10, i /= 10);

  return sum;
}

#include <stdio.h>

#define OUR_BASE 10

int main(int argc, char *argv[]) {
  unsigned long m;
  unsigned int n;
  unsigned int r;
  unsigned long d;

  if ( argc < 3 ) {
    fprintf(stderr, "USAGE: binary number base\n");
    exit(1);
  }

  m = atol(argv[1]);
  n = atoi(argv[2]);
  d = m / n;
  r = m % n;
  if ( r > (OUR_BASE - 1) ) {
    r += 7;
  }
  r += '0';
  printf("%d%c\n", d, r);

  return 0;
}

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

void palindrome(char *p, int value);

int main (int argc, char *argv[])
{
    int val[20];
    int i, n;
    char pal[20];

    n = 0;

    while (n < 20) {
        scanf("%d", &val[n]);
	if(val[n] == -1) {
	    break;
	}
	n++;
    }
    
    for(i = 0; i < n; i++) {
	pal[0] = '\0';
	palindrome(pal, val[i]);

	if(pal[0]) {
	    printf("Initial value: %d gives palindrome %s\n",val[i], pal);
        }
        else {
	    printf("Initial value: %d no palindrome found\n",val[i]);
        }
    }

    return(0);
}

void palindrome(char *p, int value)
{
    long pal;
    char str[20], rts[20];
    int i, j, len, nel; 

    pal = value;

    for(j = 0; j < 1000; j++) {
        sprintf(str, "%d", pal); 
	len = strlen(str);
        nel = len-1;

	for(i = 0; i < len; i++) {
	    rts[i] = str[nel];
	    nel--;
        }
	rts[len] = '\0';
        nel = len/2;

	if(!strncmp(str, rts, nel)) {
	    strcpy(p, str);    
	    return;
	}
	pal = pal + strtol(rts, 0, 0);
    }
    p[0] = '\0';
}

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

float root(float);

main(int argc, char *argv[]) {
        if (argc < 2) {
                fprintf(stderr, "usage: %s [number]", argv[0]);
                exit(0);
        }

        while (*++argv) {
                printf("%f\n", root(atof(*argv)));
        }
}
float root(float o) {
        float r = 0.5*(o/2);

        while ((r*r) != o) {
                r = 0.5*(o/r+r);
        }
        return r;
}

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

float root(float);

main(int argc, char *argv[]) {
	if (argc < 2) {
		fprintf(stderr, "usage: %s [number]", argv[0]);
		exit(0);
	}

	while (*++argv) {
		printf("%.2f\n", root(atof(*argv)));
	}
}
float root(float o) {
	float r = 0.5*(o/2);
	int i = 0;

	while ((r+1)*(r+1) <= o) {
		r++;
	}
	while (i < 4) {
		r = 0.5*(r+o/r);
		i++;
	}

	return r;
}