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CC - P1 - Promo 2029

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Consider the following instructions. Among the following statements, which one is true?

int * ptr = (int *) malloc(sizeof(int));
*ptr = 21;

The variable ptr is stored in the heap, the value 21 is stored in the heap

❌

The variable ptr is stored in the stack, the value 21 is stored in the heap

✅

The variable ptr is stored in the heap, the value 21 is stored in the stack

❌

The variable ptr is stored in the stack, the value 21 is stored in the stack

❌

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We want to dynamically allocate space for a string of length n. Among the following statements, which one allows to achieve this?

char * str = (char *) malloc(n * sizeof(char));

char * str = (char *) malloc((n + 1) * sizeof(char));

char * str = (char *) malloc(n * char);

char * str = (char *) malloc((n + 1) * sizeof(char *));

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What is the output of the following program?

#include<stdio.h>
int main() {
    int i = 0, j = 0;
    char str[10] = "abcdef";
    char str2[10];
    while (str[i] != '\0') {
        i++;
    }
    str2[i] = '\0';
    while (i >= 0) {
        str2[--i] = str[j++];
    }
    printf("%s\n", str2);
    return 0;
}

Error because we access an element outside the str2 array

fedcba

abcdefabcdef

abcdef

After executing the following instructions, what are the values of the variables str1 and str2 ?

char str1[100] = "abcd";
char str2[100] = "efgh!";
char * p1 = str1;
char * p2 = str2;
while (*p2 != '\0') p2++;
while (*p1 != '\0') *(p2++) = *(p1++);
*p2 = '\0';

str1 contains "abcdefgh" and str2 contains "efgh"

❌

str1 contains "abcd" and str2 contains "efghabcd"

✅

str1 contains "efgh " and str2 contains "abcd"

❌

str1 contains "efgh" and str2 contains "efghabcd"

❌

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What is the value of ?

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Soit le circuit suivant :