51) #include <stdio.h> main() { int i = 3,j; j = add(++i); printf("i = %d *p= %d\n", i, j); } add(ii) int ii; { ii++; printf("ii = %d\n", ii); } 52) #include <stdio.h> #define DEBUG(args) (printf("DEBUG: "), printf args) main() { int n = 0,i = 0 ; printf("%d\n", n); if(n != 0) DEBUG(("n is %d\n", n)); DEBUG(("%d",i)); } 53) #include <stdio.h> main() { printf("hello"); fork(); } 54) #include <stdio.h> #include<malloc.h> #include<string.h> main() { char *s2, *s1 ; // s1 = malloc(sizeof(char) * 1000); s1 = "Hello, "; // s2 = malloc(sizeof(char) * 10); s2 = "world!"; strcat(s1, s2); printf("%s", s2); } 55) #include <stdio.h> char*s="char*s=%c%s%c;main(){printf(s,34,s,34);}"; main() { printf(s,34,s,34); } 56) #include <stdio.h> #include<string.h> main() { char *s1 = "alpha", *s2 = "alpha"; if(!strcmp(s1,s2)) printf("yes\n"); } 57) #include <stdio.h> #define DEBUG(args) (printf("DEBUG: "), printf args) main() { int n = 10; if(n != 0) DEBUG(("n is %d\n", n)); } 58) #include <stdio.h> main() { int i; struct { int left,y; }a; printf("%5d\n",a[i].left); } 59) #include <stdio.h> main() { char c1,c2,c3; c1 = getc(stdin); putc(c1,stdout); // c2 = getche(); // putc(c2,stdout); c3 = getchar(); putc(c3,stdout); } 60) #include <stdio.h> #include<malloc.h> struct test{ int f; }; struct test* f(struct test * (*fPtr)() ) { struct test *ptr = (struct test*) malloc(sizeof(struct test)); return ptr; } main() { f(f)->f; } 61) #include <stdio.h> void print_in_reverse( char *str ) { if( *str == '\0' ) return; print_in_reverse(str+1); printf( "%c" , *str ); } main() { print_in_reverse( "char *str" ); } 62) #include <stdio.h> #include<math.h> //#define sqrt(x) (( x < 0) ? sqrt(-x) : sqrt(x)) main() { int y; y = sqrt(-9); printf("%d",y); } 63) #include <stdio.h> #define MAXI 100 main(){ int done,i,x=6; done=i=0; for(i = 0; (i< MAXI) && (x/=2)>1; i++) done++; printf("%d %d\n",i,done); } 64) #include <stdio.h> main() { char as[] = "\\0\0"; int i = 0; do{ switch( as[i++]){ case '\\' : printf("A"); break; case 0 : printf("B"); break; default : printf("C"); break; } } while(i<3); } 65) #include <stdio.h> #define MAXI 100 main(){ int done,i,x=6; done=i=0; while (i < MAXI && !done){ if ((x/=2)>1){ i++; continue;} done++; } printf("%d %d\n",i,done); } 66) #include <stdio.h> main() { struct emp { char name[20]; int age; float sal; }; struct emp e = {"Tiger"}; printf("\n%d %f",e.age,e.sal); } 67) #include <stdio.h> main() { char str[] = "Taj is 2 miles away"; int i; for(i=0;i<19;++i) if(isalpha(str[i]))printf("%c",toupper(str[i])); } 68) #include <stdio.h> main() { int c; while((c=getchar()) != 0){ printf("%c",c); } } 69) #include <stdio.h> f( ) { printf("I am f()"); } extern f1(); main() { int i=10; f1(i); } f1(int i ) { printf("the i value is %d",i); f(); } 70) #include <stdio.h> #define abs(x) x>0?x:-x #define mabs(x) (((x)>=0)?(x):-(x)) int kabs(int); main() { printf("\n%d %d",abs(10)+1,abs(-10)+1); printf("\n%d %d",mabs(10)+1,mabs(-10)+1); printf("\n%d %d\n",kabs(10)+1,kabs(-10)+1); } int kabs(int n) { return(n>0? n: -n); } 71) #include <stdio.h> unsigned char f(unsigned n) { static const unsigned char table[64] = { 0, 0, 0, 9, 0, 0, 10, 1, 0, 0, 0, 0, 0, 11, 2, 21, 7, 0,0, 0, 0, 0, 0,15, 0, 0, 12, 0, 17, 3, 22, 27,32, 8, 0, 0,0, 0, 0, 20, 6, 0, 0, 14,0, 0, 16, 26,31, 0, 0, 19, 5, 13,0, 25, 30, 18, 4, 24, 29, 23, 28, 0 }; return table[((n & -n) * 0x1d0d73df) >> 26]; } main() { printf("%c",f(8)); } 72) #include <stdio.h> int myfunc(char *str) { char *ptr =str; while(*ptr++); return ptr-str-1; } main() { printf("length is %d", myfunc("DESIS")); } 73) #include <stdio.h> struct _tag { int i; union { int a; int b; }c; } a; main() { a.c.a=10; printf("test %d\n",a.c.b); } 74) #include <stdio.h> main() { int a=10,b; b=a>=5?100:200; printf("%d\n",b); } 75) #include <stdio.h> main() { int a; a = (1,45,012); printf("%d", a); }
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Wednesday, January 18, 2012
C Programming Puzzles 3
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C language
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