HackerRank C language

C/"Hello World!" in C

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+
+int main() 
+{
+
+    char s[100];
+    scanf("Welcome to C programming.", &s);
+    printf("Hello, World!\n%s");
+    printf("Welcome to C programming.");
+
+
+    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
+    return 0;
+}

C/Bitwise Operators

@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+//Complete the following function.
+
+
+void calculate_the_maximum(int n, int k) {
+  int a,b,c;
+  int d=0, e=0, f=0;
+  for(int i=1;i<=n; i++){
+      for(int j=i+1; j<=n; j++){
+          a=i|j;
+          b=i&j;
+          c=i^j;
+          if(a<k){
+              if(d<a)
+              d=a;
+          }
+          if(b<k){
+              if(e<b)
+              e=b;
+          }
+          if(c<k){
+              if(f<c)
+              f=c;
+          }
+      }
+
+  }
+  printf("%d\n%d\n%d", e,d,f);
+}
+
+int main() {
+    int n, k;
+
+    scanf("%d %d", &n, &k);
+    calculate_the_maximum(n, k);
+
+    return 0;
+}

C/Conditional Statements in C

@@ -0,0 +1,16 @@
+#include <stdio.h>
+static const char *strings[] = {"one","two","three","four","five",
+                                "six","seven","eight","nine"};
+int main()
+{
+    int n = 0;
+    if (scanf("%d",&n) < 1)
+        return 1;
+
+    if (n >= 1 && n <= 9)
+        printf("%s",strings[n-1]);
+    else
+        printf("Greater than 9");
+
+    return 0;
+}

C/For Loop in C

@@ -0,0 +1,58 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+
+
+
+int main() 
+{
+    int a, b, i;
+    scanf("%d\n%d", &a, &b);
+  	for(i=a; i<=b; i++){
+          if(i==0){
+              printf("Zero\n");
+          }
+          else if(i==1){
+              printf("one\n");
+          }
+          else if(i==2){
+              printf("two\n");
+          }
+          else if(i==3){
+              printf("three\n");
+          }
+          else if(i==4){
+              printf("four\n");
+          }
+          else if(i==5){
+              printf("five\n");
+          }
+          else if(i==6){
+              printf("six\n");
+          }
+          else if(i==7){
+              printf("seven\n");
+          }
+          else if(i==8){
+              printf("eight\n");
+          }
+          else if(i==9){
+              printf("nine\n");
+          }
+          else if(i>9){
+          if(i%2==0){
+              printf("even\n");
+          }
+          else{
+              printf("odd\n");
+          }
+          }
+
+      }
+
+
+
+    return 0;
+}
+

C/Functions in C

@@ -0,0 +1,20 @@
+#include <stdio.h>
+int max(int a, int b, int c, int d){
+    int max=a;
+    if(b>max)
+    max=b;
+    if(c>max)
+    max=c;
+    if(d>max)
+    max=d;
+    return max;
+}
+
+int main() {
+    int a, b, c, d;
+    scanf("%d %d %d %d", &a, &b, &c, &d);
+    int ans = max(a, b, c, d);
+    printf("%d", ans);
+
+    return 0;
+}

C/Playing With Characters

@@ -0,0 +1,23 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+
+int main() 
+{
+    char ch;
+    scanf("%c", &ch);
+    printf("%c\n", ch);
+
+    char s[10];
+    scanf("%s", s);
+    printf("%s\n", s);
+
+    char sen[100];
+    scanf("\n");
+    scanf("%[^\n]%*c", sen);
+    printf("%s\n", sen);
+
+    /* Enter your code here. Read input from STDIN. Print output to STDOUT */    
+    return 0;
+}

C/Pointers in C

@@ -0,0 +1,26 @@
+#include <stdio.h>
+
+void update(int *a,int *b) {
+    int sum, sub;
+    sum=*a + *b;
+    printf("%d\n",sum);
+
+    if(*a>*b){
+        sub=*a-*b;
+    }
+    else{
+        sub=*b-*a;
+    }
+    printf("%d", sub);
+}
+
+int main() {
+    int a, b;
+    int *pa = &a, *pb = &b;
+
+    scanf("%d %d", &a, &b);
+    update(pa, pb);
+   // printf("%d\n%d", a, b);
+
+    return 0;
+}

C/Printing Pattern Using Loops

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+
+int main() 
+{
+
+    int n;
+    scanf("%d", &n);
+  	int size=n*2-1;
+      for(int i=0; i<size; i++){
+          for(int j=0; j<size; j++){
+              int min=i<j ? i:j;
+              min=min<size-i ? min : size-i-1;
+              min=min<size-j-1 ? min : size-j-1;
+              printf("%d ",n-min);
+          }
+          printf("\n");
+      }
+    return 0;
+}

C/Sum and Difference of Two Numbers

@@ -0,0 +1,26 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+
+int main()
+{
+	int a,b,c,d;
+    scanf("%d", &a);
+    scanf("%d", &b);
+    c=a+b;
+    d=a-b;
+    printf("%d", c);
+    printf(" %d\n", d);
+
+    float e,f,g,h;
+    scanf("%f", &e);
+    scanf("%f", &f);
+    g=e+f;
+    h=e-f;
+    printf("%.1f", g);
+    printf(" %.1f", h);
+
+
+    return 0;
+}

C/Sum of Digits of a Five Digit Number

@@ -0,0 +1,17 @@
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include <stdlib.h>
+
+int main() {
+
+    int n, sum;
+    scanf("%d", &n);
+    while(n>0){
+        sum+= n%10;
+        n= n/10;
+    }
+    printf("%d", sum);
+
+    return 0;
+}