#include<stdio.h> int main() { char *p; p="%d\n"; p++; p++; printf(p-2, 23); return 0; }
#include<stdio.h> int main() { printf("%c\n", ~('C'*-1)); return 0; }
#include<stdio.h> int main() { FILE *fp; unsigned char ch; /* file 'abc.c' contains "This is CuriousTab " */ fp=fopen("abc.c", "r"); if(fp == NULL) { printf("Unable to open file"); exit(1); } while((ch=getc(fp)) != EOF) printf("%c", ch); fclose(fp); printf("\n", ch); return 0; }
while((ch=getc(fp)) != EOF) Here getc function read the character and convert it to an integer value and store it in the variable ch, but it is declared as an unsigned char. So the while loop runs infinitely.
#include<stdio.h> int main() { int i; printf("%d\n", scanf("%d", &i)); return 0; }
printf("%d\n", scanf("%d", &i)); The scanf function returns the value 1(one).
Therefore, the output of the program is '1'.
#include<stdio.h> int main() { FILE *fp; char ch, str[7]; fp=fopen("try.c", "r"); /* file 'try.c' contains "This is Nagpur" */ fseek(fp, 9L, SEEK_CUR); fgets(str, 5, fp); puts(str); return 0; }
#include<stdio.h> int main() { int a=250; printf("%1d\n", a); return 0; }
printf("%1d\n", a); It prints the value of variable a.
Hence the output of the program is 250.
#include<stdio.h> int main() { FILE *fs, *ft; char c[10]; fs = fopen("source.txt", "r"); c[0] = getc(fs); fseek(fs, 0, SEEK_END); fseek(fs, -3L, SEEK_CUR); fgets(c, 5, fs); puts(c); return 0; }
fseek(fs, 0, SEEK_END); moves the file pointer to the end of the file.
fseek(fs, -3L, SEEK_CUR); moves the file pointer backward by 3 characters.
fgets(c, 5, fs); read the file from the current position of the file pointer.
Hence, it contains the last 3 characters of "Be my friend".
Therefore, it prints "end".
#include<stdio.h> char *str = "char *str = %c%s%c; main(){ printf(str, 34, str, 34);}"; int main() { printf(str, 34, str, 34); return 0; }
#include<stdio.h> int main() { printf("%%%%\n"); return 0; }
#include; int main() { printf("%x\n", -1>>1); return 0; }
Binary of 1(2byte) : 0000 0000 0000 0001 Representing -1: 1s complement of 1(2byte) : 1111 1111 1111 1110 Adding 1 to 1's comp. result : 1111 1111 1111 1111 Right shift 1bit(-1>>1): 1111 1111 1111 1111 (carry out 1) Hexadecimal : f f f f (Filled with 1s in the left side in the above step)Note:
1. Fill with 1s in the left side for right shift for negative numbers.
2. Fill with 0s in the right side for left shift for negative numbers.
3. Fill with 0s in the left side for right shift for positive numbers.
4. Fill with 0s in the right side for left shift for positive numbers.
#include<stdio.h> int main() { unsigned int res; res = (64 >>(2+1-2)) & (~(1<<2)); printf("%d\n", res); return 0; }
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