Added #19 Counting Sundays

19 files changed, 29 insertions, 0 deletions

diff --git a/01-Multiples-of-3-and-5/euler1 b/01-Multiples-of-3-and-5/euler1
index 585d380..585d380 100755..100644
--- a/01-Multiples-of-3-and-5/euler1
+++ b/01-Multiples-of-3-and-5/euler1
diff --git a/02-Even-Fibonacci-numbers/fib b/02-Even-Fibonacci-numbers/fib
index e9b1b3b..e9b1b3b 100755..100644
--- a/02-Even-Fibonacci-numbers/fib
+++ b/02-Even-Fibonacci-numbers/fib
diff --git a/03-Largest-Prime-Factor/largestprime b/03-Largest-Prime-Factor/largestprime
index c2afe6f..c2afe6f 100755..100644
--- a/03-Largest-Prime-Factor/largestprime
+++ b/03-Largest-Prime-Factor/largestprime
diff --git a/04-Largest-Palindrome-Product/palindrome b/04-Largest-Palindrome-Product/palindrome
index f4d607f..f4d607f 100755..100644
--- a/04-Largest-Palindrome-Product/palindrome
+++ b/04-Largest-Palindrome-Product/palindrome
diff --git a/05-Smallest-Multiple/smallmult b/05-Smallest-Multiple/smallmult
index 5f4e692..5f4e692 100755..100644
--- a/05-Smallest-Multiple/smallmult
+++ b/05-Smallest-Multiple/smallmult
diff --git a/06-Sum-Square-Difference/sumsq b/06-Sum-Square-Difference/sumsq
index 8f8aa03..8f8aa03 100755..100644
--- a/06-Sum-Square-Difference/sumsq
+++ b/06-Sum-Square-Difference/sumsq
diff --git a/07-10001st-Prime/10001prime b/07-10001st-Prime/10001prime
index a9cc351..a9cc351 100755..100644
--- a/07-10001st-Prime/10001prime
+++ b/07-10001st-Prime/10001prime
diff --git a/08-Largest-Product-In-a-Series/productofdigits b/08-Largest-Product-In-a-Series/productofdigits
index 9d3f349..9d3f349 100755..100644
--- a/08-Largest-Product-In-a-Series/productofdigits
+++ b/08-Largest-Product-In-a-Series/productofdigits
diff --git a/09-Special-Pythagorean-Triplet/pyth b/09-Special-Pythagorean-Triplet/pyth
index e778cfc..e778cfc 100755..100644
--- a/09-Special-Pythagorean-Triplet/pyth
+++ b/09-Special-Pythagorean-Triplet/pyth
diff --git a/10-Summation-of-Primes/sumofprimes b/10-Summation-of-Primes/sumofprimes
index a175f6a..a175f6a 100755..100644
--- a/10-Summation-of-Primes/sumofprimes
+++ b/10-Summation-of-Primes/sumofprimes
diff --git a/11-Largest-Product-In-Grid/prodgrid b/11-Largest-Product-In-Grid/prodgrid
index 5054666..5054666 100755..100644
--- a/11-Largest-Product-In-Grid/prodgrid
+++ b/11-Largest-Product-In-Grid/prodgrid
diff --git a/12-Highly-Divisible-Triangular-Number/bigfactors2 b/12-Highly-Divisible-Triangular-Number/bigfactors2
index 3e409b1..3e409b1 100755..100644
--- a/12-Highly-Divisible-Triangular-Number/bigfactors2
+++ b/12-Highly-Divisible-Triangular-Number/bigfactors2
diff --git a/13-Large-Sum/largesum b/13-Large-Sum/largesum
index 8c9de24..8c9de24 100755..100644
--- a/13-Large-Sum/largesum
+++ b/13-Large-Sum/largesum
diff --git a/14-Longest-Collatz-Sequence/collatz b/14-Longest-Collatz-Sequence/collatz
index 37da709..37da709 100755..100644
--- a/14-Longest-Collatz-Sequence/collatz
+++ b/14-Longest-Collatz-Sequence/collatz
diff --git a/15-Lattice-Paths/lattice b/15-Lattice-Paths/lattice
index 1f7bba2..1f7bba2 100755..100644
--- a/15-Lattice-Paths/lattice
+++ b/15-Lattice-Paths/lattice
diff --git a/16-Power-Digit-Sum/sumexp b/16-Power-Digit-Sum/sumexp
index 854ac69..854ac69 100755..100644
--- a/16-Power-Digit-Sum/sumexp
+++ b/16-Power-Digit-Sum/sumexp
diff --git a/17-Number-Letter-Counts/wordnums b/17-Number-Letter-Counts/wordnums
index dc75675..dc75675 100755..100644
--- a/17-Number-Letter-Counts/wordnums
+++ b/17-Number-Letter-Counts/wordnums
diff --git a/19-Counting-Sundays/countsundays b/19-Counting-Sundays/countsundays
new file mode 100755
index 0000000..f5f9aa9
--- /dev/null
+++ b/19-Counting-Sundays/countsundays
diff --git a/19-Counting-Sundays/countsundays.c b/19-Counting-Sundays/countsundays.c
new file mode 100644
index 0000000..e3f4d5a
--- /dev/null
+++ b/19-Counting-Sundays/countsundays.c
@@ -0,0 +1,29 @@
+#include <stdio.h>
+#include <time.h>
+
+// Implemented a timing routine for fun :)
+
+int main(){
+    clock_t now, then;
+    int c = 0;
+    struct tm time = {0};
+
+    then = clock();
+    time.tm_mday = 1;
+
+    // Starting from 1-1-1901
+    for(int y = 1; y <= 100; y++){
+	for(int m = 0; m < 12; m++){ // Apparently January is the 0th month, 
+            time.tm_mon = m;        // even though there's no 0th day.... wtf K&R??
+	    time.tm_year = y;
+	    time_t inttime = mktime(&time);
+	    struct tm *t = localtime(&inttime);
+	    if(t->tm_wday == 0)
+		c++;
+	}
+    }
+    printf("%d\n", c);
+    now = clock();
+    printf("Only took %f ms\n", (double)(now - then) / (CLOCKS_PER_SEC / 1000));
+    return 0;
+}