{"id":10225,"date":"2022-09-22T21:15:11","date_gmt":"2022-09-22T15:45:11","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-segmentaion-fault-in-c\/"},"modified":"2022-09-22T21:15:11","modified_gmt":"2022-09-22T15:45:11","slug":"solved-segmentaion-fault-in-c","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-segmentaion-fault-in-c\/","title":{"rendered":"[Solved] Segmentaion fault in C"},"content":{"rendered":"

[ad_1]
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int *ptr;<\/code> is a pointer to an interger, but you never initialized it. The value of ptr<\/code>is not defined so this is undefined behavior. To make your code work, the value of ptr<\/code> has to be an address of a variable with type int<\/code>. *ptr<\/code> and **p_ptr<\/code> tries to read the value where ptr<\/code> refers to and this causes the segmentation fault. Adapt your code like this:<\/p>\n

main()\n{\n  int myInt;               \/\/ local varibale myInt\n  int *ptr = &myInt;       \/\/ pointer ptr refers to local varibale myInt\n  init(&ptr);              \/\/ pass pointer to ptr to function init\n  printf(\" %d \\n\",*ptr);\n}\n<\/code><\/pre>\n
Note in function init<\/code>, p_ptr<\/code> now is a pointer to ptr<\/code> and so a pointer to a pointer to myInt<\/code>.<\/p>\n
Of course you can allocate dynamic memory too:<\/p>\n
#include <malloc.h>\n\nmain()\n{\n    int *ptr = &myInt = malloc( sizeof( int ) ); \/\/ ptr refers to dynamicly allocated memory\n    init(&ptr);             \n    printf(\" %d \\n\",*ptr);\n    free( ptr );                                 \/\/ free the dynamic memory\n}\n<\/code><\/pre>\n<\/p><\/div>\n
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            <\/span> <\/p><\/div>\n<\/div>\n
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solved Segmentaion fault in C <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] int *ptr; is a pointer to an interger, but you never initialized it. The value of ptris not defined so this is undefined behavior. To make your code work, the value of ptr has to be an address of a variable with type int. *ptr and **p_ptr tries to read the value where ptr … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[324,712],"class_list":["post-10225","post","type-post","status-publish","format-standard","hentry","category-solved","tag-c","tag-pointers"],"yoast_head":"\n[Solved] Segmentaion fault in C - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-segmentaion-fault-in-c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Segmentaion fault in C - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] int *ptr; is a pointer to an interger, but you never initialized it. 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